Scheduling multiple sessions at once? You can do it all at once (without having to repeatedly input your contact info). Here are some hints:
When you get to this screen, click "create repeating appointment or choose additional time"
Here you can select repeating sessions (for example, every Friday at 9 am) or simply select additional times.
Wanting even greater customization and control? You can create an account by clicking the log in button in the upper right hand corner of the site.
You will also have a chance to create an account once you've made an appointment.
If these tricks aren't working, do let me know and I can help you schedule sessions.