MotionDuck packs in Premiere Pro will have no apply button and the After Effects version will have an Apply button. If you cannot apply templates from the MotionDuck extension, here is what to do:
SOLUTION
If you downloaded both versions of the pack, please uninstall the pack. Here’s how:
Click on the “Duck” logo at the top of the extension.
Hover over the pack and click the “X” icon to uninstall. You might need to uninstall both the After Effects and Premiere Pro version.
Restart After Effects and/or Premiere Pro
Install the pack. Install the After Effects version in After Effects and the Premiere Pro version in Premiere Pro.