Create your first map by clicking on +Content in the left menu.
Click Apps in sub-menu and then click Location Map.
This brings up a content block with a 'master' map. If you want this location leave as is.
Note: if you change that location, it will change in any other place that you have a the site. If you need a different location, delete this content block and following the instructions below:
Add a different location to a page on your website:
Go to google maps and search for the location.
Click the Share button.
Click Embed a map.
Here you can select the size that you would like to embed; medium is the default, medium is small than the standard in the public website builder, so you might choose a larger size.
Click Copy HTML.
Go back to the public website builder and click on +Content in the left menu.
Click Apps in sub-menu and then Custom HTML Code.
Paste the code from Google Maps and click Continue.
You should see the map on the website page.