You have a 5 minute window to self-cancel an active lineup after you submit it.
This 5 minute window does not apply if ANY of the games in your lineup have started or if your lineup includes a 2nd Half (2H) or 4th Quarter (4Q) pick.
Active lineups can only be self-cancelled outside of the 5 minute window if 1) you have a DNP in your lineup, and 2) none of the other games in your lineup have started.
To self-cancel an active lineup, visit the "My Lineups" tab and click on the three dots on the top right.