Note, this is for commissioners force adding and dropping players from a team. If you are trying to adjust a lineup, please see this article.
This is only possible on the mobile app right now.
- Go to Standings list of teams
- Tap on a team / roster
- Scroll to the bottom (Edit Roster)
If you want to move draft picks around as well, that can be done directly on the draftboard after the draft order is set.