Many menu entries are also accessible by a key combination, we call that a shortcut. For example pressing the ctrl+s keys together makes Bluefish save the current file to disk. You can see the shortcut key combination on the right of the menu entry.
What many people do not know is that they can be changed. Move the mouse over a meny entry, and press the key combination you would like to use. Immediately this combination will show up on the right of the menu entry. An entry can also be removed, press the backspace key when you move the mouse over a menu entry to remove the shortcut.
To save the shortcut key combinations for later Bluefish sessions you can store them. In the Options menu choose Save shortcut keys. This will store the settings in file ~/.bluefish/menudump_2. If you want to restore the default combinations simply remove this file and restart Bluefish.