How to unassign a task from myself or a team member
To unassign a task, click on the current assignees to bring up the assignee dialogue box.
Click X next to the assignee that you want to remove.
After you remove someone as an assignee, they will still be following the task. You can remove yourself as a task follower, but cannot remove anyone else, so users will have to remove themselves.
To stop following the task, click on a task to maximize it, then click on the ellipses (three dots) in the top panel. Then, select "Unfollow". You can learn more about following and unfollowing tasks here.
Learn more about assigning tasks here.