If you are the league commissioner, your powers allow you to rename the league and remove members from the league at your discretion.*
If you are a league member you can create and play contests as well as invite new members to the league at your discretion.
* Note: DraftKings monitors for behaviors that can be viewed as predatory by DraftKings management or your opponents. When predatory behavior is encountered, DraftKings Game Integrity and Ethics Committee reserves the right to close the Commissioner's league(s).