Try refreshing the page or give it a few days as they may be varifying the picture to make sure its not breaking any rules but once you have one up and after you want to change it, it will be a lot easier to do so. Give it time it will come.
Re: profile picture
By: Ogma / Beginner Dec 14, 2015
Post # 8
I found that it accepts some png files too. I don't know for sure why people are having problems with sideways pictures, but it might have to do with tablets and smartphones displaying them correctly when the file is actually oriented incorrectly.