If a provider allows clients to schedule or reschedule appointments you can do so through the Fons portal or, if you are not currently a client and don't have a Fons account, you can go through the providers public booking page if they have enabled that.
Scheduling an Appointment from your Fons Portal
Sign in to your account at https://fons.app/login
Click on the +New button and select appointment
Select from the options presented
Choose provider and, if applicable, who from your family will attend the lesson.
Click NEXT
Select the preferred date and time > click NEXT
Click Book it to schedule, or Back to make edits.
Scheduling an Appointment via a Public Booking Page
Go to your providers public booking page (contact your provider if you do not know the URL.)
Select the appointment type from the options presented (different providers offer different services and some do not allow clients to book at all, always check with your provider if you are looking for an option that is not presented.)
Select your preferred date and time > click NEXT
Enter your Email address
If you are an existing client you will log in
If you are a new client you will create an account
Click Book It to schedule or Back to make edits.