Saving The Map
When you have a map that you like the looks of, you can click "Use Map" to preserve its settings and allow you to start making custom modifications to it.
All you need to do so is to enter a name for the map, and a "URL name" that appears in the url, for example:
http://gtx0.com/map/demo
Altering the "Name" will automatically update the "URL name", however you can customize the URL name to whatever you wish.