Hi Sean Johnston,
Re: "use keyboard to change keyboard brightness"
If your Mac has keyboard brightness keys: On the keyboard, press the increase brightness key or the decrease brightness key . To turn backlighting off, keep pressing
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Else: if needed: You can also adjust keyboard brightness right from the desktop by adding the Keyboard Brightness module to the menu bar or Control Centre. Choose Apple menu > System Settings, then click Control Centre
in the sidebar (you may need to scroll down).
Go to Keyboard Brightness on the right, then turn on Show in Menu Bar or Show in Control Centre.
To adjust the brightness, click the Keyboard Brightness icon in the menu bar or in Control Centre.
More info: Apple support's online article: Turn your Mac keyboard’s backlighting on or off - Apple Support
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Also: Keyboard shortcuts (if your Mac has keyboard brightness keys):
- Option-Keyboard Brightness Up: Open Keyboard preferences. This works with either Keyboard Brightness key.
- Option–Shift–Keyboard Brightness Up or Option–Shift–Keyboard Brightness Down: Adjust the keyboard brightness in smaller steps.
Above is from: Mac keyboard shortcuts - Apple Support
All the best :-)