Go to the store and see if there is a WIFI password posted on the wall. If not, buy a cup of milk tea and ask for the password.

Generally, you need to use someone else's WIFI to surf the Internet. You need to ask the WIFI owner, and he will tell you the password, so you can use it.

If it's a hotel, ask the hotel front desk. If it's a hotel, ask the waiter inside. If it belongs to the company, ask the staff inside. This is a private matter, just ask him himself.