Yes. Inside the Wipster Panel navigate to the video you'd like to sync to your timeline. If the video is not already synced to your open timeline you'll see a button underneath the thumbnail giving you the option to sync.
Clicking this button will associate whatever is in your timeline with this clip in Wipster, so be sure to check if it's the right clip (if you get it wrong don't worry, you can always undo it).
Once the sync is complete you should see the option to add comments as markers to your timeline.