Here's a short video from Espi at the Vodafone Help centre showing us how to set up WiFi on the Samsung Galaxy Tab.

It's clearly shown on the video how to do this but you just tap the Applications Menu on the Homescreen, then tap Settings and select Wireless and Network.

Then click WiFi settings and turn on WiFi. Select your network and enter your password.

To find out all about the Samsung Galaxy Tab you can read all the articles posted by 3G here.