From OUYA Wiki
Upgrade to "Pro" to start at a promotion of your choice with full privileges - such as hiring new talent. This also grants you access to the editor, where you can save your changes to all 350 characters to create your own universe. You can then enjoy acting out your own dream matches with no pressure in "Exhibition" mode.
When editing rosters, the right thumbstick can be used to switch character slots - or move them to a different company entirely.