How to go Wong Tai Sin temple when I am staying in Regal View, Tsuen Wan? Thank you

I think you mean Royal View hotel in fact. You can take Royal View Hotel shuttle bus or minibus 96M, 96C or 96 to Tsuen Wan MTR Station, transfer to HK MTR tsuen wan line to Prince Edward to take Kwun Tong Line to Wong Tai Sin Station. Go out of the station from Exit B2, turn left and walk for about 5 meters, you will reach the temple.