The furniture store is located at postal code 121, and appears as a set of tools on your map .
You can only buy furniture for your house. You cannot add furniture items to a motel/hotel room.
Once you enter the furniture store, you will be able to walk up to a category and scroll through the different items by pressing E. Press Enter to purchase an item.
Use arrow keys Left and Right to rotate a furniture item.
After you have made your purchases, you can exit the furniture store and head back to your house.
See "Placing Furniture" for how to place your furniture pieces inside your home.