The Customer User Interface (CUI) page is the page that your parents will access to book their appointments. The address for this page is located at the top of the UI Setup page, and is in the format https://www.pickatime.com/schedule.jsp?ven=1160xxxx where the xxxx is an account number specific to your school.
Copy and paste this URL to a new browser window
Login in with your email address and password
If you receive the error message "There are no events currently available" then you probably have not yet set the "start day.." and "end day of appointment taking" settings that are on the UI Setup page. Any days that you want to make available for parents to schedule appointments should be within the start and end date specified.
If you receive an error message "Failed to find student", check the values that you have entered in the CUI with the values for that student that are in the Contacts section of the VUI.
Once you have tested the CUI and are satisfied that it is set up correctly, you are done. As you have set the Start Date of Appointment taking and your End Date of Appointment taking to include your test day you will most likely want to return to the UI Setup page and reset these dates for your parents. See the Turn it On section again to see how to modify these dates.