Hi Johanna,
reading your post, I am not sure at wich point you’re struggling:
- do you want to share the route with your buddies or
- do you want to save the route for later usage?
- do you want to save the route on your computer or your mobile?
You mean using the website on your computer - right?
… than you can keep it and e.g. import it again at a later time.
See also Save route after creating - #5 by linux-user
Of couse. See Planning Your First Route
Manfred