ChatGPT is available within candidate records to build out candidate profiles, job records to build out the Job Description, as well as any email communication or email templates. This is a token based system, and those can be purchased for your entire database under Tools & Settings > Manage License section within Tracker.
Under Licenses & Credits you'll see a grocery cart icon that will allow you to purchase more AI credits:
Select the number of credits you would like, and click 'buy'.