To change your Wi-fi password, you just need to follow the below steps.
To start, you will need to connect an ethernet cable from your modem directly into your computer.
1. Open up an internet page and in the web address bar type in: 192.168.20.1
2. Login using admin for Username/Password
3. Select Wireless, then click on Security
4. Type in your preferred password (min. 8 characters long) in the WPA/WAPI passphrase box
5. Press apply/save and test your password