To change the order of your services, you first need to log into Start Booking. Once you are logged in, navigate to your services here: https://app.startbooking.com/services.
On the services list, you will see a small grid icon on the left side of each service. To change the order, click on the grid icon for the service you want to change and drag it up or down.
The order that is displayed on your service list is the order they will be displayed on your booking page.