How to put on a profile picture on facebook using the iphone facebook app?

Well i recently just joined FaceBook as all my friends were telling me to get it. Anyway i have the app on my iphone4s and i want to have a profile picture. In my camera roll i clicked on the arrow and then facebook but it then it says post. Also i tried going onnm profile and clickin on the actual profile pic bit but nooothing happens when i do. When i upload a profile picture will this mean that it will post on my wall aswell? Any help please i'm so confused!

My iPhone 3G, works perfectly fine, but the light is dim as hell?

OK, so I dropped my iPhone inside the toilet. When I got it out and dried it with a napkin it was fine, the touch was good, the light was good, everything was fine. I turned it off, and about two hours later the light went dim. It's like almost black. I don't know what to do? Let me remind you that it's old, and it's kinda loose, and it has a few cracks here and there.

Does your iphone warn you when you're using data?

I just got an iphone 5 today and I only want to use data when it is absolutely necessary. I will be connected to Wi-Fi almost always but I don't want to get disconnected and charged for data. Will the phone warn me when I'm about to use data?

ITunes Match not showing some songs?

- I recorded 3 of my own songs in my studio (so its not a digital rights issue)
- I added them to the iTunes on my home computer and then selected to add them to iCloud.
- They were immediately available on my iPhone 5 and iPad 3, so clearly they are on the cloud.
- I came to work, opened iTunes, and the songs will not show, yet I'm connected to the cloud and can see and download other songs on the cloud.
- I tried transferring purchases from devices and checking for available downloads

All computers, iTunes and devices are up to date. Computers are authorized and logged into my account in iTunes.

How can I get my computer to show the songs? This is the first time I have had any issue with this stuff. It has always been pretty intuitive and worked well before.