You can locate the 'Manage Travelers' option in the Trip Overview tab. This feature is handy for adding, removing, and managing traveler roles, including adjusting access permissions if needed. If you can't find the 'Manage Travelers' option, ensure you're logged in with the required permissions. As a collaborator, you should be able to manage these functions if you have 'Full Access' permissions. Refreshing the page or logging out and back in might resolve any visibility issues.