Hey Kitty, I remember you! : D Welcome back to Evelon!
Basically, how it works now is you get two breeding slots per month. These slots can be used for any breedable species except Diosol (so Kuhna, Lucain, Paragon, and Soveris). You can either use one slot to do a breeding with another person, or both slots to do a breeding by yourself. You can post a room whenever you want, as long as you have enough slots to start it, as well as enough KS to cover the cost.
Once you're in a room, you have to make 25 posts in order to complete the breeding. If you fail to respond to a post within 7 days, you'll fail the room.
After you finish your breeding, all you have to do is wait for your babies to show up in the Nursery. Once they've grown, you and your partner post in the Nursery indicating which ones you want.
I think that covers the basics, but if you're still confused, all the information can be found right
here. Hope that helped! : )