How do I get to Citygate coming from Casa Hotel at Yau Ma Tei, Hong Kong and what is the store hrs?

You can take Tsuen Wan Line, get off at Lai King Station. Then transfer to Tung Chung Line to Tung Chung Station, Exit C. It takes around 40 mins on the way. The ticket fare is 16.5 HKD per person. After arriving, walk southwest around 100 yards (90 meters) to find the destination.
As I know, the opening hours of most stores are from 10:00 to 22:00.