Choose Edit > Keyboard Shortcuts.
Choose Window > Workspace > Keyboard Shortcuts & Menus and click the Keyboard Shortcuts tab.
If the keyboard shortcut is already assigned to another command or tool in the set, an alert appears. Click Accept to assign the shortcut to the new command or tool and erase the previously assigned shortcut. After you reassign a shortcut, you can click Undo Changes to undo the change, or click Accept and Go To Conflict to assign a new shortcut to the other command or tool.
To save all changes to the current set
of keyboard shortcuts, click the Save Set button . Changes
to a custom set are saved. If you’re saving changes to the Photoshop
Defaults set, the Save dialog box opens. Enter a name for the new set
and click Save.
To create a new set based on the current set of
shortcuts, click the Save Set As button . In
the Save dialog box, enter a name for the new set in the Name text
box, and click Save. The new keyboard shortcut set will appear in
the pop‑up menu under the new name.
To discard the last saved change without closing the dialog box, click Undo.
To return a new shortcut to the default, click Use Default.
To export the displayed set of shortcuts, click Summarize. You can use this HTML file to display the set of shortcuts in a web browser.
To discard all changes and exit the dialog box, click Cancel.