dwMap offers a free version and a Premium version. The free version is fully functional and offers all the features that you need to create routes and follow them on your Garmin watch. When you install dwMap and setup your account here you are automatically in free mode and can use the app forever for free. If you want to upgrade to Premium you can click on a Premium link on the site and get immediate access to the extra features.
Premium offer advanced features including customizable watch data fields, watch route navigation prompts and off-course warnings, background maps (on many watches), an iPhone/Android Companion App, route Archive and Collections, waypoints/geocaching, GPX exports and no advertising.
The information on these dwMap help pages generally applies to both the free and Premium versions of dwMap. Information on using the additional features in Premium is available in dynamicWatch Premium Features Help.