Draw up?

I’m new to knitting. I’m working on this pattern
http://www.bbc.co.uk/stoke/my_pages/babywear/hkp/012.shtml

I have the whole thing knitted I just can’t figure out what

Draw up one side to form a crown

That means? Please someone help me:heart:

you need to gather up one end, to close up the top of the hat, by running a thread through the stitches or ribs one end and Drawing it up. Like a draw-string, pull it tight and secure thread, then continue sewing down the side seam.