|There are two passwords (using common parlance) that should be changed:|
1. Your pass phrase, pass key, or whatever you happen to call it. This is the one you use to connect to your Wifi and would need to be changed on all devices that use it (computers, iPads, and so forth).
2. Your router access password. This is something you type in the browser, along the lines of 192.168.1.1 (it varies). It takes you to the place where you make router settings changes. This password can be changed from any computer on your network.
It's a pity that use of the word "password" for both has come into being but I guess that's life. Same as a computer reboot (restart) has now become corrupted to mean Factory Restore. Being cavalier with the terminology has sure caused confusion.
Always pop back and let us know the outcome - thanks