Apartment with 1 bedroom, problem with adding a single bed

Hello to all.

I'm new to Booking, learning how and what to do. I ran into a problem.

I added a new property and selected a 1 bedroom apartment. But now I have problems with adding beds. My bedroom has one bed and that's what I chose. However, I have 3 beds in the living room and I chose to have 3 but there is no option to write what types they are. Well, in the search result, it says that I have 3 sofa beds, but I don't, I have one large sofa bed and two single beds.

How to add a bed for one person in the living room to a 1-bedroom apartment?

Thanks in advance for your reply, best regards, Mladen