If you decide a journalist who is currently on your media list should be removed, you can do so from the Media List or from the journalist's profile page.
From a Media list:
Step 1: Navigate to the Media Lists page
Step 2: Select on the Media List you’re removing a journalist from
Step 3: Click the three-dot icon to the right of the journalist you’re removing and select Remove from Media List
From a profile page:
Step 1: Navigate to a person’s profile by clicking their name.
Step 2: Click Add to Media List on the right side of the journalist’s profile
Step 3: Unselect the Media List you’d like to remove the journalist from
The checkbox next to the Media List will be unchecked and the journalist will no longer appear on the Media List.