Takedown allows for scheduling a dual meet against any team except your own. To workaround this intentional limitation, create an Opponent Team with your Roster and call it something similar to your My Team name. Schedule a dual meet with this new Opponent Team. Thankfully, there's not much typing required. You just need to know which buttons to tap.
Here's a screen recording to guide you through the process. The My Team name is "Davis Senior High School" and the Opponent Team, constructed from the Davis Roster, is "Davis 2".