BEST BIKING ROADS
Ok , have a browse in your documents you should have a "my garmin" file in there, also in start menu open the garmin folder and see if you have an application called mapsource.
Assuming above all in place, once on the best biking roads.com site, select a route and click on gpx ??.
select open with
select other
select mapsource
mapsource should open, on the menu on left hand side, click on tracks, highlight and double click whatevers there, select show on map.
This will show the track as dashes on a map of the area in question.
If you want to save then in mapsource just click on file save as (call it whatever you want) save it in docs in the my garmin file.
N.B. The routes on best biking roads are gpx files of tracks ie, they are not routes in the proper sense of being ready to send to your device.
Constructing routes whether in mapsource or basecamp is whole other can of worms!!
loads of tutorials on this site for both, personally i use mapsource, cant get my head round basecamp although its on my radar to do list.
Have a look here
http://www.ukgser.com/forums/showthread.php?341756-Converting-tracks-into-routes
oh heres a random gpx download from best biking roads, you will notice its now a gdb file, this is auto when opened as described above.
View attachment Fierze_Fle-bbr.gdb