... yep, under the trip rope cleat (vario cleat) you pull out the rope, re-position so that the length is shorter or longer. No need to adjust any other bits as the line length trim is still good.
Yep, its that's easy!
cheers,
Robbie

ps check manual, shows you in there on page 4.6.3, download it here:
https://www.northkites.com/uploads/tx_vipmediadownload/nkb_mnl13_bar_en.pdf