i tryed all options at official wallet but gives everytime an other walletadres but not the onlinewalletadres where the rsunits were send to
If i am not wrong there is an option to download the wallet file. You have to do something with that to access from the official wallet your address.
You may lookup there forum i am sure there is an info how to do this:
https://nxtforum.org/mynxt-info/