How do Access Keys work?

Access Keys are already active and configured after the installation of the plugin.
They can be changed in the plugin settings if for some reason you need to change the keys combination.

The keys combination depends on the browser and O/S used, for example ALT+ACCESSKEY or ALT+SHIFT+ACCESSKEY on Chrome, ALT+L to open/close the Screen Reader, etc Refer to the following link for a list of common modifiers:
https://en.wikipedia.org/wiki/Access_key