Hello Robert,
GEO my WP and Job Manager Geolocation add-on ( which you purchased ) are two different plugins. You don’t need to install GEO my WP plugin, you need to download Wp Job Manager Geolocation add-on and install it on your site. You can download it from Your Account page under Downloads tab ( download the file wpjm-jobs-geolocation-1-7-7.zip ).
After installing and activating the add-on you should then see the settings in the Job Listing settings page.
Also, I am not sure to which documentation you referring to, but the documentation for Wp Job Manager Geolocation add-on can be found here. It shows steps by step how to install and use the plugin.
Let me know If you still have any issues or questions.
Thanks,