How to open a shower in Home Inn?

Unscrew it directly by hand, there is a button at the switch position, lift that up, and then the shower will have water and can be washed;

There should be a change-over switch below. One is to pull it up directly, and you can take a bath when you pull it up. The other is to turn it to the position where it is out of the water, and you can start taking a bath.

If not, call the front desk clerk and ask him to help someone open it.