please help me - it's urgent...

my plant is getting too big (tall) so i need to top it to control it's height...

but how do your properly top a plant? please explain in terms a newbie like me would understand

you just snip the main growing shoot. it shows a pic in here.
https://www.rollitup.org/view.php?pg=faq&cmd=article&id=383

also some good info the these other categories.

https://www.rollitup.org/view.php?pg=faq&cmd=category&id=34