To add a player to your Lineup you must be signed in to your MUT Watch account.
Select Lineup from the My Items menu. You will see your lineup for Offense - with buttons available to toggle to Defense or Special Teams.
Click on the Lineup position that you wish to load. If you have any eligible players in your binder, they will be listed along the right-side of the screen. Click on a player's name to load a side-by-side comparison of the current Lineup Starter and the proposed Lineup Starter.
If you would like to promote the player to Starer, click the "Promote to Starter" button. This will place the selected player into your Lineup and return you to the full Lineup view.