It is not possible to change the associated user for an existing recurring data job. The job you want to update must be canceled and then recreated under the new user.

To prevent this from being an issue in the future, consider setting up a shared user account or use the Become User feature to manage your recurring jobs. In this instance, should the managing user leave, only the password on the account needs to be changed instead of recreating the jobs under the new user's account.