How to change Wi-Fi password?

I have a linksys router and have little to no clue on how to change the password. The current password is the preset one with the 30 or so different letters. So long as this is set as my password I have no way of connecting my iPhone or iPod. I don't have an Ethernet cord that will connect my router to the computer to access the routers web-based set-up page. Also, I'm not exactly the most "Techy" person ever so even if the answer could be simplified it would be greatly appreciated.

If you have remote managment enabled, then you can type the following into a web browser

192.168.1.1

And that will take you to the router managment

If not, then you will need to borrow or buy a cable and connect to the router that way.

You need to find your Wi-Fi router address, input it in your browser which will come up with your Wi-Fi router settings, and choose "change password"