So he's what happened for me:
Chose whatever photo I had of myself for my profile picture.

Then in the menu (for edit profile) there is a box named 'verify profile picture'. This is where you upload the photo of you holding up a hand written sign.

It's a bit strange when you start but whenever I select something in a menu I have to scroll all the way down past the menu before I actually see what I've selected to update. Might just be my phone though, I've gotten used to it.

Hope this helps.

Step one

Step two (this is the part with the sign)

Then someone somewhere confirms the faces match, make sure there nobody else in the photos or it will keep getting rejected... Trust me. Took a few attempts and some careful reading to figure out what they where talking about.