Where's the problem? Go to the teacher's page, click "book now" and then fill in the dialogs one after the other.

I must say I find the booking process a bit of a disaster area. What I normally do is I find my last booked lesson and then click on "book another session". Sometimes I have to go via the teacher's own home page, which is annoying, especially as my teacher doesn't appear in my "my teachers" area! I suppose it's quite nice in a way that a website like this makes it quite difficult for you to spend your money. At least they're not greedy!

Some teachers teach every day of the week, twelve hours a day. Others teach a few hours a week and their regular students take most of the spots. My French teacher is popular, and she never has openings in the current week, so I book four weeks at a time. You may need to book further ahead or to switch teachers.