Just went into my account to find it for you, @Abrasha-and-Maria0 , and my heart nearly stopped. All my hosting information was gone, even when I went to airbnb.ca/host. So just a side note, if that happens to anyone else today, you can find it through "Messages". Just go there, and the Host dropdown will appear at the top of the screen. Phew!
But back to your question. In Listing Details go to Property and Guests. Hit Edit beside that. There you can look in the dropdowns to find what you need.