delet the firste emailaccount library on windwos 10 will not work

Hello together, when I first installed ditital Edition, for the ebook Reader Tolino, i've had on email account. so, I descided to make a new email addresse at the toline ebook book store, and the also a third email account. Now: the ting is: By deinstalltion the digital Reader on my Windwos 10, and reinstall the whole Thing, the ditital Edition will outomatically start's with my first email address I had.. so far.. and Idid me looged in at Adobe with my first email and also the passord, but,,, but deinstalling the digital editon with that first emailaddress I had, and the same passsord…. I'd wont work!!! What I accutaly wanted is just log in with my third emailladdress on the digital edion, but first I do nid do deinstall the library with thos books . German or Englisch answer is ok. George