You don't give the brand and model of your router so I can't give detailed steps, but it's the same simple process for all of them. You access the router's setup pages using your Web browser (Internet Explorer, Firefox, Chrome, etc.), then enter the new password where it tells you. If you don't know the current password and can't access the setup pages, you can reset the router using the recessed pushbutton found on the rear panel. Then you can log in with the default username and password.
You can find full details for your router at the manufacturer's website, where you can download manuals and find other helpful information. Also, sites like
this one can give you the default password information for most routers to get you started.
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