I wrote a pm to head master Gangolf about this but he seems to be out of office. Does anyone else know?

"I remember you wrote how to change ones profile picture to another one, one already has uploaded to SP. But I forgot how to do it, can you help?"

I believe you simply click on the photo. At the top in the edit bar there is a link that says make this my profile picture. That should work.

Thanks. I was looking in an other direction.

Yeah, I have troubles everytime I upload photos. haha