They were not designed to be serviced normally. If it is just loose there is a factory bulletin on repair. But, if it has to come off, here is how. Thanks
Transmission Control Lever Knob Replacement Removal Procedure
Important: Be careful of cosmetic damage to the emblem. In case of damage, replace the emblem with a new part.
Important: Use adhesive LoctiteTM 270 with Activator 7471 or Activator 7649. DO NOT operate the lever until the adhesive has dried (approximately 30 minutes).