Guest Smiler,

WPA/WPA2 setup was straightforward. Go into the router setup and select the WPA/WPA2 option in the security section. You will be prompted for two passwords, one for full access to your network and one for guest login - the latter just enables internet/email access on a visitors computer and doesn't permit any access to the rest of your network.

Once you've done that, logout and go round and change the wireless access passwords on all your computers, including any smartphones you use. At least that was what I did.

Oh - Don't forget to hardwire the computer you use to change your settings to the router while you are making the changes.

Once you have done that, it is probably a good idea to hide your SSID. That way, casual freeloaders will not become aware of your existence.