As a Commissioner you have been assigned the “Division Manager” role within the system and should see a “Teams” tab at the top of the main website. Here is a direct link to the Teams Page.
From the Teams Page select your Program & Division.
Select Players from the Edit menu of the team you want to work on.
Select the players (drawn from your division) which are currently unallocated and click Add Selected to add the players to the team.
To assign Managers, Coaches, Team Parents, etc. simply rinse & repeat but select Team Personnel from the Edit menu this time.