Entered wrong wireless password and don't know how to change it

I recently switched to a Macbook Pro from a PC and attempted to connect to my 2Wire home wireless network on it. Unfortunately, I entered the password wrong on the secured network, and now the computer regularly tries to connect automatically to the internet with this incorrect password that it has saved, and I have NO idea how to get in there and change it. I have tried all I can think of with my limited knowledge of Macs. It will not connect to the internet, therefore, on my home network but does work on other networks.
Can someone please tell me where to go/how to access the saved password so I can delete it and change it? Also, whenever I click on the assistance button it always asks me whether I have a DHCP or PPPoE connection...and I have no idea what this means. The DHCP option leads me to the point where it says I cannot be assisted, and the PPPoE option takes me to a page where it asks for the network name and password, but when I enter it correctly it gives me no indication of the result of typing it in...it just reroutes me back to the page that asks me to choose between PPPoE and DHCP. A.K.A. it is NO help at all.
And I don't understand what it means when it asks me to "save password in keychain." What is a keychain??? I'm a Mac idiot. I can troubleshoot all this stuff with a PC but am completely lost with my new Mac.
Thanks-

Keychain access is in the Utilities folder in Applications. The network password is in the "System" section. Unlock the chain, select the item corresponding to your network and click the "-" button. Then go back and set up the connection again.

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Entered wrong wireless password and don't know how to change it

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