Important: Right now, all of this is only possible on Mapify's web version, visit https://mapify.travel.
If you created spots before discovering the trip feature, don't worry. A trip is created with a trip tag you add to your spots description and you can still do this afterwards. Just start a new spot, create the trip you want to start whenever you get to the spot description. Share this spot and then visit all the spots you want to edit to this trip, open the single spots and click on the edit icon on the top right corner. You can now add the trip tag you created to this spot as well, making it part of a trip.
Pro tip: You can easily change the order of your spots in a trip by opening your trip and clicking trip edit.
If you want to learn more about how to create a trip on Mapify, watch this video :)