It took me awhile friday night to figure it out.
After you use the go advanced button you will have a choice of from where to choose your pictures.
waaay over on the right side will be an upload button. In the process of finding my pictures and getting them attached the upload button was kind of pushed out of the way on my monitor screen. Its on the right hand side and it should say upload photo. Again, its after you have chosen which picture you want to post.
Hope this helps:
Click go advanced
Click manage attachements
Click choose file
after you've chosen your file over on the right hand side it will say upload photo.
Good luck!