Top right hand corner of your screen, click on my account. On the left hand side, It'll say Your Profile, than Edit Profile Picture beneath it. Click that, upload picture, and job's done!
Thanks for reply but I'm using iphone4 and this is a app. Ive looked on every thing there's to look on and can't find it lol :/
Next time you're on your PC, just follow my instructions. I don't believe you can change your profile picture from the GC App, could be mistaken though, as I don't use it.