Really enthusiast about BTS project and love the margin feature, though I can't find a way to close it (settlement). Any help much appreciated !!! @medvedus @britcoins!

So here are my 3 screenshots: Initially I had a BTS balance approx. equivalent of the margin position today, and I'm just trying to get the BTS back. I'm probably missing something.

Why should I add bitUSD to my balance as asked, since I just want my BTS back... ?
Even if I lost that amount of $50, why is it not deducted automatically from my BTS position in the margin..?

Thanks for your time !