I'm new to mudlet and new to coding in general. Yes, I know this is jumping into the deep end

What I want to do is make a Trigger that shoots out a one time echo when my HP reaches a certain threshold. There's a forum post here and an example in the Mudlet Manual on HP Triggers but I am probably just not entering it into the right box.
So it would basically be something like if HP <= 1900 then echo "Powerswing"....or something to that affect.
Thanks in advance!