For the posting picture problem you can send admin (Pete) a Personel message and email the pictures to him and he will send you a link.
To change/setup your avatar you will have to go to your profile and then to avatar. You will see this block of writing
'Only one image can be displayed at a time, its width cannot exceed 150 pixels, the height cannot exceed 200 pixels, and the file size cannot be higher than 64 KB.'
Then youcan browse your computer for an image the right size to use.
hope this helps - any problems send a PM to admin, hes the best to sort out a problem.
hope this helps