how to I change my wi-fi password

With a Ubee Gateway you would want to go to http://192.168.100.1/ in your browser and login with the default information, the user name is just "user" without the quotes, and password is "user" without the quotes as well. 

Once logged in you will see a Wireless link on the top of the screen that will allow you to change the Network Name/SSID to what you want the router to be displayed as in the wireless list, and the ability to change the WPA Shared Key as the wireless password. Once you have changed those to what you want you will need to apply the changes on the bottom to take effect.
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