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I hope you have connected to Linksys Router..
If so, this is what you have to follow.
1: Find default gateway address ip address. If your system is WIndows you can find by
Click Start > type CMD press enter key
This opens Command Prompt Window
2: On Command Prompt window, type ipconfig press enter key
Under Wireless adapter, you can see system ip address and its gateway..
Note down default gateway ip address, this would you be your router ip address
3: Now open Browser, and type gateway ip address on address bar and press enter key
This takes you to Linksys router console.
4: Enter Linksys console username and password
5: Once logged in, click Wireless Tab > Security
There you can change guest password ***** your router
Note: You must press the save button after entering new password
Let me know it helps...
Please feel free to ask if you stuck somewhere. I am waiting for your reply