Hong Kong To Enping Roundtrip (non-stop)

You mean Enping city in Guangdong Province? If yes, you can take the direct bus at Crown prince sports field or Tsuen wan tak Wah Park to get there directly. The bus departs at around 07:00 daily. Ticket fare is about HKD 150 and duration is about 4 hours.
For return trip, you need to get onboard at Enping Long-distance Bus Station. I'm not clear about the schedule. You can consult the staff there upon arrival.