There are two places to administer GMapsPro. The most important is at:
Here you will find controls that allow you to edit the GMapsPRO configuration. Most settings are under the "GMapsPRO Configuration" button.
There is also a plugin, which can be accessed at:
Then chose the GMaps plugin. This plugin allows you to display maps within the text of your Joomla pages (as opposed to on a page of their own). We have not used this feature in the template but it is available to you.