Simply go to https://iforgot.apple.com on any device and follow the prompts to reset your password. You can have the password reset emailed to your Apple ID, or choose to answer some security questions you created.
After adding your iCloud account when prompted during set up, or by going to Settings >> iCloud. Simply go into Settings >> iCloud if you aren't already there and you'll see a range of switches allowing you to turn of individual iCloud features or all of them using your iCloud only for iMessage at that point.
iCloud is a powerful tool that offers a lot of functionality for free. It is not recommended to turn it off, however it is easily possible. You don't need an iCloud account at all to use an iPhone effectively.
You'll need to go into your Settings then Wifi. You'll be able to turn it on and see near by networks. Simply tap on your network and enter a password if necessary.
It's worth noting that wifi supports hidden networks as well. So if you've set your network to hidden, you'll need to tap other networks and enter the network name manually.
Also, wifi has multiple standards throughout the years. Each iPhone supports the latest standard from the year it was released. If your iPhone is too new for your wifi or your wifi too new for your iPhone, there could be compatibility issues. Likely this relates to 2.4GHz vs 5GHz. A setting on newer routers. The iPhone 4S and under support 2.4GHz while the iPhone 5 and newer support 5GHz and 2.4GHz.
One of the first and easiest things you can do is update your software. Apple releases free, iOS updates available through iTunes. These updates often include fixes and performance improvements for both the phone and its firmware.
Carriers also update their software from time to time. These carrier updates normally download automatically, but if they don't you can go to Settings > General > About to manually trigger them. Learn more about Carrier Updates here.
Though its not likely the issue if you have no signal, having GPS and Wifi turned on can help improve wireless signal if you're just having problems with poor signal. These can both be found in your settings.
Lastly, check the Settings > Cellular section. These have several options such as roaming and turning off 3G. If for some reason 3G/LTE is turned off, well thats your problem. But you would have needed to turn it off to start with so this is likely not the case.
If nothing has worked so far, it could be a hardware problem. A quick trip to the Apple Store should pinpoint the problem for free, though a fix may cost you if you're out of warranty or its accidental damage.
You won't be able to stop them all easily, but there are a few other things you can do.
Home your homescreen, if you tap on an app that is loading, it will pause.
If you tap an app waiting, it will skip to the front of the line and start loading.
And finally if you restart your iPad, apps paused from loading, should cancel themselves.
If you want to take black and white pictures, there is a fantastic app called Camera Noir that does just that.
ColorBlast is a great tool to turn already captured photos black and white.
Many popular camera apps like Flickr and Instagram also offer black and white filters.
Press and hold the home button and Siri will be listening. You can say anything, but if you press the I you'll get a list of some common commands.
This means the app has been removed from sale, either by Apple because of a problem with the app or the developer because they no longer wish to sell it. You won't be able to redownload the application.
However, if you synced with iTunes on your computer at some point before deleting the application, a copy will be there. You can then sync with iTunes to put it back on your device and it should work as long as its compatible with your version of iOS as apps not updated can sometimes lose compatibility over time.
Open your Settings.app, find the General section then the Restrictions section. Turn on Restrictions then down the list you'll find a switch that will allow you to turn off In-App Purchases.
On iOS6 and iOS5 you can open the App Store on your device, go to the Updates tab, and At the top you'll see a Purchased section. All the apps here are apps your downloaded, free or paid, and can be redownloaded at no additional cost.
Its important to note that you can't buy an app twice. So if you go into the app store and search for an application, the buy button will instead say install if you've downloaded it before.
iTunes on Windows and Mac also offers a purchased section of all your music, videos, and apps. You can use it to download apps then sync your iOS device to get them there. But this isn't necessary on devices running iOS4 or later.