Mistake on pairing app with Tacx Flux S

I installed the Zwift app on my Android Tablet and created an account.
After that I saw some unknown buttons and I can not recall which one I pushed. Anyway, I have no connection now. I tried to solve the issue and found which button I should have pushed. I am quite sure I did not do it correct.
What I did is following: I uninstalled the Zwift-app, shut down my tablet and restarted it. Then I re-installed the Zwift-app, but I did not receive the possibility to connect with my Tacx.
Does anyone has a soltion for me?