Under Preferences | General, there is a Keyboard Shortcuts section. Use this section to change the keyboard shortcuts away from their default settings.
At the top of this window, there is a Filter Commands item, a Filter Keyboard Shortcuts item, and several icons indicating the contexts in which individual shortcuts can appear: 
Navigator, 
Filmstrip, 
Manager, 
Develop, 
Editor, 
Print, 
Video a 
Viewer.
Filter Commands
In this field, enter the name or part of the name of a feature or tool, and the program will automatically show all features that are in the list that contain that text.
Filter Keyboard Shortcuts
When this field is active, press the specific keyboard shortcut that you want to find. All the functions that can be controlled by that key are displayed.
Under the top of the window, a column listing all commands, their shortcuts, and an indication of the contexts in which a given shortcut is available (
) is displayed.
If the arrow icon is dimmed, that means that this shortcut currently is not active for the given context, but it can be activated. If the icon is lit up, the shortcut is active in the given context. If the icon is missing completely, the given command does not appear at all in the given context (e.g. a keyboard shortcut can only be set for the Liquify function within the Editor, because the Liquify function does not appear at all in the other parts of the program).
Changing Existing Shortcuts
Hover the mouse over the line for the given function. 
and 
buttons will appear. Click the button and confirm that you want to remove the shortcut. Then click to show the Add Keyboard Shortcut window. In the New Keyboard Shortcut field at the top, enter the key you want, and then choose in which contexts it should be active. Then confirm the changes.
Removing all Custom Settings
At the bottom right of the window, there is a Default button. Click this button to remove all customizations in this window, restoring it to its default state.