Change password on Mac wi-fi network

I have an existing network set up for my wi-fi and use apple time capsule as a router at home.
I want to update the network password as I have not done this.
I also want to set up a guest network account that I can separately set up access to.
CAn some one help me with how I should do this?
THanks
CHris

Welcome to Apple Support Communities.
Looks like you'll need to run AirPort Utility from your iMac to make changes to your Time Capsule setup. Instructions begin on Page 8:
http://manuals.info.apple.com/en/TimeCapsule_SetupGuide.pdf
Instructions for guest wireless client setup begins on page 22 with the heading
"Allowing Wireless Clients to Access Your Network Without Entering a Password"

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