I cant adjust trainer difficulty

Hi, I just connected a kickr core as a controllable trainer and when I use zwift I run out of gears and can’t get over 35km/h .I tried to adjust the trainer difficulty but there isn’t a slide button to adjust it with. Any help will be appreciated. Thanks

Hey @Troy_Elyard, something must not be paired correctly. What are you using for power? Are you using ANT+ Fec or Bluetooth?