Garmin only gives numeric club IDs. Name them once and the names stick everywhere — shot list, popups and stats. Averages shown are Garmin's lifetime figures.
Excluding a shot never changes your score. Strokes only move when you add them yourself on a hole. This controls whether those additions feed the statistics.
Wipes every stored round and every correction from this browser, then reloads with nothing. Export your corrections first if you want to keep them.