Can I get directions from Minghang Hotel to the metro and metro instruction to get to Hong Kong?

Hi, you can walk 10min or so from the hotel to Gushu metro station. There you can take subway line 1 (Luobao Line) to Luohu. Cross the immigration to Lowu, HK. Then transfer to other means of transportation to your destination.

I have another suggestion: take a taxi from the hotel to Bao'an Airport and take an intercity bus to HK directly. There are many drop-off sites. Just get off at the closest one.