In order to publish Aggregate Team Results to RunSignup you must create a Report with a Team Finisher List section, then auto-save that Report to RunSignup.
First, click Build Report:
Then you will need to name your report, select which Team Types are included if applicable, and save.
Then when you save that report, you'll see the auto-save settings:
Then when you're setting up your auto-save settings, you can send a new result set to RSU: