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Posting results can sometimes be the tricky part of running a Virtual race. If you use the RaceJoy app, your results should upload automatically (it's recommended you familiarize yourself with the app before using it for the first time).
If you're inputting your results yourself, basic instructions are posted HERE.
And great news - RunSignUp has just rolled out integration with GPS devices and apps like Strava, so you can upload your performance that way. Details are explained HERE,