When you leave Shenzhen Railway Station, you should also have instructions to go to Luohu Port, and then go through the customs. After coming out, go directly to the subway station and take the subway to the university station.
If you arrive in Hong Kong on 2 1, some students will meet you at Hong Kong International Airport, Hung Hom Station and University Station. If you go to these three places, don't worry, some students will take you to CUHK.
Anyway, many local descriptions of foreign tourists like this are perfect and should be found. If you can't find them, ask someone else. The Putonghua of Hong Kong people is still quite good.
Welcome to cuhk ~