How to change number of listed Bedrooms?

[Ernesto Hernandez]

I googled and searched BP but couldn't find a good answer. 

My question is, how do you "update" the number of bedrooms a house is listed as having? 

Assuming you follow Brandon's advice and find a house large enough to add a 3rd or 4th room, how could you update the records to reflect the additional room as opposed to it being labeled as a 2 bedroom with a "bonus" room? 

TIA