You can get premade layouts from here --> http://layouts.mibba.com/Profiles
And to add a profile picture go to 'My Mibba' and on the right side you'll see a section called 'Profile' in that section click on 'photo' and you can upload a profile picture from there.
If you want to add more to your gallery go to 'My Mibba' and scroll down and on the right side you'll see a section called 'Gallery' just click on photos under that section and add them from there.
Hope that helped:]