What highlights actually do
Underlining a line is the thing this whole app runs on, and until now nothing ever said what it does. Open Profile and there's a short page about it: the lines you underline steer what you're shown next, underlining someone's words doesn't mean you've liked them — you can mark three lines and still pass — but liking someone does need at least one underline. That last rule was always there. It was only ever enforced, never explained.
It explains itself before it asks
Signing up now says it out loud, too. A screen ahead of the tutorial lays out what marking a line actually does — three plain statements, each with a real mark sitting under it — before anything asks you to make one.
The tutorial waits for you now
The "This is how it works" step no longer makes you watch it, either. The stretch that pressed the heart, the cross and the back button for you is gone — those are yours to press now, one named action at a time, waiting as long as you need. It keeps a short list of what's left to try, and while you're looking for your first line it mentions the thing that trips people up on a phone: dragging straight up or down scrolls instead of marking.