As the League Manager (LM), you not only control how the league is set up but also have the "power" to edit many parts of how the game works. This includes the ability to set your league's fees, manage other team's rosters, adjust the scoring for any game, veto trades, post messages on your league office, manage other team's roster transactions as well as many others. Below is an example of the tools which allow you to change another team's roster.
As the LM you have full control over your league You can assign other team owners to have LM powers You can override any transaction made in the game View full screen