RaceApp has two places to manage rosters:
The process for managing athletes is the same for both. You may import athletes via a CSV file or edit each entry one-by-one.
In addition for your own roster, you can import from MileSplit or Athletic.net. Just paste in your team page URL and hit Import.
Use temporary/guest athletes when the other teams attending do not have their own RaceApp accounts.
To add athletes: