How can I delete a wireless network from my MacBoork Ai

How can I delete a wireless network from my MacBoork Air.
I had set up a WEP Network but I need to set up a WPA (personal) network now and i cant seem to change the WEP network to a WPA2 network.
Thank you for any help you can provide me.
LShaps

The MacBook Air will autodetect WEP and WPA security changes and should allow you to reconnect again. If the password stored in the Mac is wrong, it will ask you to enter it again.
With that said, to forget a network do the following:
- Go to the Apple Menu and select System Preferences
- Click on the Network icon
- Highlight the Airport / WiFi entry (sepending on 10.6 vs 10.7)
- Click the Advanced button at the bottom
- Make sue the Airport / WiFi tab is selected
- Click on the network name you want to forget
- Press the minus button at the bottom of the list.
You may also want to consider restarting if you are having this issue.

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