What you're talking about is Sliding into their DMs, just be smart about how you do it so you don't come off like Drake or that NFL player that were trying to slide into that Pornstars DMs.
The best way is to obviously follow them first and like a couple of their recent post not all of them.
Remember DM don't comment that's what every other thirst with no game does.
Read some of the comments guys leave on her pictures so you know what not to do when you DM her.
Hopefully this helped and good luck.