So as my second project, im knitting my daughter a monkey. I have knitted everything except for the limbs. I have finished the first arm and am working on the hand. This is an Alan Dart patter from Irresistible gifts to knit vol 2. after the middle fingers it says 'draw up tightly and fasten off, then join finger seam'. so far all i've done is break yarn and thread it through the sts on the needle and pulled it tight. I am unsure how to 'fastnen off and join the finger seam'. Thanks in advance for the help!