Pairing a Magic Mouse to a Mac mini

https://support.apple.com/en-us/HT201178

This support document says do this:

1. Connect a Lightning to USB Cable1 or a USB-C to Lightning Cable to the Lightning port on the device2 and connect the other end of the cable to your Mac.
2. Make sure that the device's power switch is in the ON position. (Green is visible under the switch when the device is on.)
3. Choose Apple () menu > System Preferences, then click Bluetooth to open the Bluetooth preferences window. When the device pairs with your Mac, it appears in the list of devices.

How exactly do you choose the menu and select System Preferences and click Bluetooth when you're trying to pair a mouse? Especially a mouse with a lightning cable stuck in it. Com'on man.

Really should do much better.

So how to you pair a Magic Mouse with a Mac mini?

Thanks very much.

P.S. Note in the footnotes: 2. Magic Mouse 2 can't be used while connected to the cable.