hi there! I am just a model on MFC, so have never purchased tokens for myself. Here is the link I found that has some instructions. I hope this helps! Also, if it doesn't answer enough of the question for you, I recommend reaching out to the support team via the additional link! They are pretty fast at getting back with you and have always been a great help to me! 
Information Link:   https://wiki.myfreecams.com/wiki/Payment_Methods

Customer Service (Click the contact us link within the text to submit a ticket):  https://wiki.myfreecams.com/wiki/Contact_Support#Contact_support

I'm sorry I couldn't be more help, but I hope I did a little! Thank you for reaching out to me! Have a good night!

I will gladly send you a pair of worn panties for 2500 tokens (thats $125 USD). shipping is included, and is also anon!