The Recruiter you add to the job posting is the Recruiting manager, meaning the person listed as the contact person, as well as the sender of all the automatic messages send from Teamtailor.
To change the recruiter for a specific job, go to the job in question and click the pen to enter the editing mode.
Under the stage Hiring team, change the Recruiter and save the ad.
❗ Only users with an admin access level can change a job postings recruiter.