1: First connect Fitmo to your Runkeeper account:
2: Setup your Runkeeper to fetch your workout data from Garmin Connect.
Once the two are setup you should automatically see the workouts appear in Fitmo. There might be a delay dependent on the synchronisation cycles of the different platforms.
Note: The data synchronoised will also be made available for your coach to see - if you do not wish to share that information then you should not create the connection.
Note: Fitmo will not go in and download historical data. It will only receive new running data.