IIRC with the 2013 kites you tie a knot on the PIGTAILS OF THE KITE, not in your bar's lines.
To check the trim of your bar's lines: you're making sure they are all the same length (the ends line up) when the bar is sheeted in (on the CL). All Cab bars (from 2010 on, for sure) are trimmed like this. In fact, most kites are trimmed like this... it's a shame there's no way to check that the bridles on the kite are properly trimmed too

Then, if you want to mess with the trim on the beach, use the knots on the rear pigtails - center knot should be "all equal", nearest-the-kite knot will sheet the kite in more (supposedly better for lighter wind) and the furtherest-from-the-kite knot will limit how much the kite sheets in so you *could* use it when overpowered, but you're safer to get a smaller kite.
To the OP: you have to untwist the lines by spinning the swivel on the CL... with your hand.
With the pre-2012 bars, the safety line would twist around the center line, if you kept doing rotations in one direction only and could bind up when released, which is a reason why they changed for the more complex and finicky 2012+ QR.
Jeez people, trimming your bar n' lines is basic stuff!

EASIEST way to attach the lines - attach a line to a tree, then tie a granny knot around the lines bar-side of where the Amsteel pigtail are larks headed to the lines... don't be poking the knots with screwdrivers