You'll have to log-in to the wireless router. If it is an off-the-shelf router you can consult the documentation or use a search engine to find out the default username and password for the router. For example, if you have, say, a Netgear WGR614v9, you would Google "default username and password for Netgear WGR614v9" You will also need to know what to type into your web browser, such as
http://www.routerlogin.net (for a Netgear).
However, if someone set the router up for you, they most likely and should have changed the password if not also the username. You may have to call them to find out that info. If the ISP installed the router, call them.
Once signed-in to the router look for something like "wireless settings" or similar. Then just change the passphrase.
Be advised that making the passphrase shorter or easy to remember jeopardizes your network security. If you have any valuable data on your network you shouldn't be letting customers on it without taking precautions.
So, are you aiming to get rid of your encryption key or the fact that you need a password to access the router?
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