Thanks John - I actually changed it by clicking the 'sharing' button. It then prompted me to change to 'public' :)
Hi Natalie - You just need to edit the route and then resave it with the new setting. To edit the route click the Edit link in your My Routes panel on your home page (after signing in) or the Map link in your My Routes panel on the route planner and then click the Edit This Route button on the map. When your save the route you can then change any of the previously specified settings you want e.g. Private/Public, name of the route, etc.
I have created a map that I want to change from private to public. How do I this?