There's an option in Dolphin Browser to customize the gestures which also shows the list of recognized gestures. I don't have my eDGe on right now, but if you tap the little picture of the hand, then it expects you to give it a gesture. One of the options at that point should be to customize the gestures. (Or try getting there through the menu button). When you get to that menu, it will show you a list of all the gesturable (?) functions, and show you the gestures currently associated with each one which you can edit.