1. Take the subway from Mong Kok Station and choose the red line (Tung Chung Line) to Central Station.
2. Change to the Purple Line (Hong Kong Island Line) at Central Station and go to Wan Chai Station.
3. After getting off at Wan Chai Station, follow the instructions to the south island line platform of MTR and take south island line to Kowloon Bay Station.
4. After the exit of Kowloon Bay Station, you can take the shuttle bus or taxi to Kowloon Bay Exhibition and Trade Center.
Generally speaking, this line does not need to transfer to different lines in the same station, so it is easier to identify. If you need more detailed information or have questions about other routes, please feel free to ask me.