When The Dyrt suggests a stop, it's only a suggestion based on the criteria you plugged in during the initial phase of the building set up.
It is, however, easy to change any stop you like!
Directions for the App
Clicking a map pin - From the map summary, you can click a pin and it will open that stop. You have a choice to delete it from there. At that point, it completely removes it from the trip. You can add another stop by adding a pin on the map or using the spyglass to search for something new and all the choices along your route will show up. Just zoom in and choose one that fits your needs.
Swiping up from the bottom to see the entire list of campgrounds -
Swiping up from the bottom lists your trip one stop at a time. Here, it's easy to replace a campground, delete a campground or add notes to the trip itself for reference.