Original von dave-f
As I said, configuring them is not the problem but using them.
When you get to the khotkeys configuration area, make sure the gestures aren't globally disabled. Then make sure that groups of gestures aren't disabled.
I had trouble in KDE 3.2.0 getting gestures to work, but once I upgraded to 3.2.2, I had no problem. All you have to do (if your khotkeys settings are left default) is to press and hold the middle mouse button (or the wheel button) and then perform the gesture that corresponds to what you want to do. Then release the button, and the command will be given.
For instance, to close a tab in Konqueror, press and hold the button and make an L shape (going from top down, then to the right) with your mouse, then release the button. The tab should close!