So I have purchased a few btc using margin but what I am having trouble understanding is how much interest am I paying on that? I see my margin position and I see that I currently owe $1.99 in interest but I can't find what my rate is.

My understanding of what a swap is is that it is locking my in for a certain amount of days at a certain interest rate? If a purchase a swap after having an open position can I somehow apply that swap to my open position? How do I determine how many swaps I need to cover my current position?

Sorry for all the questions but I can't seem to find any guide on bitfinex about how this works. I understand margin, options and many trading concepts but I'm just having a hard time understand how swaps and interest rates work on bitfinex... seems like some important UI components are missing?