Aha allows users to have a lot of presets. But if you ever feel like you want to remove some, or if you simply decide that you want to change the order in which they appear in the app, you can do that by visiting Edit Presets within the Settings screen.
While there you can move presets up or down on the list, as well as remove them altogether. Simply tap the green up/down arrows to change the order, or select stations for removal by tapping the circle to the left of the station name.
Once you have selected a station to be deleted, you should notice the Delete button appear at the bottom of the screen.
NOTE: You can't delete the Traffic, Coffee, Hungry or other location-based stations.