From the CaraMaps website, once logged in to you account, click on the 'travels' tab and then on 'new travel'.
You can then define the departure and arrival points. After that, you will only need to click on the steps you want to add them to the trip.
Don't forget to save the trip !
On the CaraMaps app, in the 'travels' tab, select '+ new trip'. Start by naming the trip, define the departure and arrival points and the date. Once the trip saved, you only have to click on it and to use the map mode to add the steps you want.