Navmii used to have an old manual at http://www.navmii.net/bin/Navfree_UserGuide_v1.0.1.pdf
The link no longer works.
Here are some basics:
Basic Navfree Help
Navigation is easiest if locations are added to Favourites before navigating.
To check a location before adding it to Favourites, or find a location near another location:
Tap Menu icon at bottom right of map screen. Tap Navigate on Main Menu. Tap Address or Google.
Type name to find. Done. Tap down-arrow beside item . Tap Show on map.
Check it is the correct place. If so tap down-arrow and Add to Favourites.
Or drag map to required location. Tap on map. Select Add to Favourites. Change name if required.
To enter a route from A to B, when A is not the current GPS location.
Need to disable GPS in Android Settings - Location.
Easiest if A and B are entered into Favourites. Use Google Search or Address to find names and descriptions, then Add to Favorites.
Then tap Navigate on Main Menu. Tap Favourites and select A.
Tap box with Favorites name in it, and select 'Route from Here'.
Tap Menu icon at bottom right of screen. Tap Navigate. Tap Favourites.
Tap 'Route here'. Tap 'Selected' (not Gps).
Tap 'My Route' to see Route on map.
To clear route: From Main Menu, tap Clear Route.
Cant edit or delete (sometimes) Favourites. Use Jota app . See forums.
Still looking for manual, there blog is very helpful which is the link above.