I've never had a problem; I assume you've registered and signed in?
Its then just a click of 'Upload Photos & Video'
click 'Choose photos and videos'
browse to the photo you want the 'Open' it;
Then click 'Upload Photos and Videos'
Then its in your album, and you can edit if you wish
If you want to then share it I click 'Share This' and 'Grab html' then copy a line like
http://farm5.static...._698204fdce.jpg (there's other garbage but you don't need it) and paste it 'Insert Image' link here:
Its easier just to attach the photo to this site 'Use Full Editor'
browse and attach the file, then click 'Attach This File'