When you're in the 10to8 web-app, find the "Customers" tab in the left-hand side menu.
Booking with a customer
You can book from this tab by clicking on the "Book" button on the top right-hand side when you select a customer.
By clicking on the 3 bars next to the search field, you have the option to select customers by:
Names, tags, emails, phone numbers, addresses and custom fields
Show inactive customers
Show customers without registered consent
You can also delete a customer's record at the bottom of this page or export their record to an Excel file.