After connecting to your Osmo Pocket using the Wireless Module with DJI Mimo, click the three little dots in the lower left side.
The icon you want is the one with the four squares with one empty.
You can update the SSID and the password, as well as change the connection type, etc.
You may need to go through the same process of connecting manually to new WiFi settings if you’re using the Google Pixel 3. Read about connecting by clicking here.