To configure the key bindings select Settings->Configure Key Bindings from the Menu bar.
This will bring up a dialog box.

To edit the key bindings, the first thing you need to do is find the action you want to edit. All of the possible actions are listed in the combo box labled Action. By using the scrollbar, locate the action you are interested in and click once with the left mouse button.
Once you have selected the action, you can turn your attention to the bottom half of the dialog box. You use the bottom half of the dialog box to change the key bindings.
By selecting this option, the currently selected action will not have any key binding.
By selecting this option, the currently selected action will use the default key binding. Once this option is clicked, the key binding column above lists the default key.
By selecting this option, the currently selected action will use any key combination you choose.
You determine the key combination by placing the appropriate checks in the check boxes labeld Shift, Ctrl, and Alt. You can select any combination of these keys.
You can also click on the large button with a letter in it. Now type the letter or function key you want to use. The letter will change to the typed letter.
When the combination is correct, you can either select another action, or press OK to save all changes.
If you click on the Cancel button, you will return to editing your document, without saving the changes.
Clicking on the Default button, you will change all keybindings back to their default value.