1: Take the subway in Causeway Bay (to Sheung Wan), transfer to Admiralty (to Tsuen Wan), go to Tsim Sha Tsui, go to Tsim Sha Tsui East Station, then transfer to east rail line and get off at the University.

2: Take the subway in Causeway Bay (to Sheung Wan), transfer to Admiralty (to Tsuen Wan), transfer to Mong Kok (to Tiu King Ling), and transfer to Kowloon Tong (east rail line) and get off at the University.

You can search the subway map of Hong Kong. It's easy to see.