You might be able to use scheduled messages for this. You can find more about scheduled messages and how to create them here: https://www.airbnb.com/help/article/2897
but that doesn't help you with the phone app arrival instructions. I actually couldn't find anything in the Resource Centre that links to the phone app option.
@Yoyo14 you can do this, but ONLY in the app on your phone. 🙂 they don't send it, but they tell the guest where to find and, and I tell the guest - TWO times, to have the phone app installed, but that at least 50% of my guests get lost or park in the wrong spot..... you can't force people to read or follow instructions! But, we can do as much as we can to make it fool-proof.
you can add photos with step by step instructions, here's a sample of mine: