@leocg Hi Leo, I think i figured it out. and sorry for the double post. I though it my first reply didn't go through so i re- typed it. when it comes to all this, it can be a little confusing!! But anyways, Thanks for the reply!!
Scroll down to the botton! and you will see the choice for do it. 'Delete my account' ... follow the steps, and confirn if you're sure you do not want it anymore.
@jvariance I got them working by trying and retrying, while others worked right now. That's strange. For me, the Android version was the hardest, though, while on my laptop logging in was flawlesse.
But I'm happy right now, that I've already four devices logged in.