I would revisit the instructions, I think you missed step E, specifically "If you would like the bike centered, choose one of the other holes in the bolt action tube(A)" because there is 2 holes that you can screw on the quick locking lever. See picture attached. Good luck.....

Here is the instructions from Cyclops about Attaching your bike:
A. Insert bolt action tube into trainer (tapered end toward center of frame).
B. Insert quick release handle through slot in frame and through the middle hole of the bolt action tube and screw into place. As the trainer cones are sesigned for use with the supplied skewer,
you must replace your rear skewer with the one enclosed.
C. Lift up bike by the seatpost and position the left side of your bike skewer
into the left cone.
D. Pull down the quick release handle to capture the right side of your bike skewer. Quick release handle must be all the way down in locked position. Adjust fixed cone by loosening lock ring and turning cone-as needed.
E. The bike need not be centered on the resistance unit to function properly. If you would like the bike centered, choose one of the other holes in the bolt action tube(A), and adjust the release lock ring(C). Adjust the left cone accordingly, so that the bike is held tightly in the trainer. Be sure to remember to re-tighten the lock ring. You can now let go of your bike; the trainer will now support the bike on its own.