First head over to Settings in Storemapper.
Scroll down to start location and start zoom.
Start location can be anything that you would type into Google Maps: a zipcode, country, city, state or specific address. That will be the center of the map when it initially loads.
Start zoom is a relative zoom number for the map. Setting it to zero would show the whole globe, around 3-4 will show a continent, and 7-8 will be quite zoomed in to a city level. Play around with it a little until you get it just right.
[alert]Not working like you expect? Maybe this article on how the map initially loads will help.[/alert]