When you attempt to install this addon, it will check to make sure that you have both the Page List+ and Address Geocode addons already installed. If either of these are not installed, you will recieve a notice to install them before proceeding.
Installation of this addon adds both a new dashboard page under 'Page List+' as well as a new 'mapping' tab in the edit dialog of Page List+ blocks. The dashboard page allows you to do a site-wide configuration of all maps. The mapping tab allows you to configure the map on a block-by-block basis.
Once you have configured the map, either at the site or block level, you will need to update the block template to use 'Map'.
All of the configurations of Page List+ are available for choosing which pages show on the map. The only caveat is that any page that you wish to show on the map must have a valid 'coordinate' attribute (supplied by the Address Geocode addon).