Here is probably how to change the password:
1) Makes sure you're connected to the wireless, and go into your web-browser and type
http://192.168.0.1 (might be
http://192.168.1.1)
If a thing comes up asking for your username and password, this is good
2) Enter the following for username and password; Username: admin, Password: admin
The username could also be blank, 'user' or 'default'. If none work, just gimme the model of your router, and I can figure it out.
3) A control page will come up. Look for wireless security. NOTE: If your security is set to WEP, change it to WPA or WPA2. WEP is very easily hackable (like a 10 year old kid can do it).
4) Save changes, and you're good
Note: If your housemate person or w/e has WEP security, get someone to hack it and use their internet for a while to make it even
.