Kim,    billzhou  may have the best solution for you.

Kim, why don't you buy ITCs to pay for sessions?

ITC is currency on italki site. You buy some ITCs to pay teacher's session. Just confirm the amount and input your trading password every time you reserve session.

Buying ITCs is very easy.Many payment ways are supported. I use alipay to buy ITCs. Alipay is a most popular online payement in China. I usually buy $100 equivalent ITCs every time. An 1.5$ processing fee is charged by italki site.

Kim, if you post a link  to the teacher you chose, I think I can help  by guiding you from there.

Thanks a lot ! Oh, so I'll go to the bank and buy ITCS. 

I chose her: https://secure.italki.com/sessions/request.htm?cid=28233&stype=1&tlen=2

Can you help me to pay ? Thanks a lot !