To activate the maps in your search, please first make
sure you have entered a Google Maps API Key in the
settings (there is a video that walks you trough this, and
it only takes a minute).
(You can get to the above page by going to Settings menu, then WP Instant Leads)
STEP 2. Next, you will see a Maps Search button on the search
controls bar, you can click it to activate maps.
(This is your main WP Instant Leads search page, and you will find it from your admin navigation on the left)
There is a video here that will walk you through the setup process: