To use this couch in your scene, simply open your scene, and got to a.) File b.) Append c.) Now navigate to the file's location, and select blend file labeled 'sofa.blend' d.) Select the folder labeled 'Object' e.) Press 'A' on your keyboard, and then 'Enter' f.) Now that the sofa is in your scene, select the Plain Axis in the center of the couch (resembles a plus sign [+]) g.) Press 'G' on your keyboard to move to the desired location (pressing 'Shift+Z' immediately after 'G' snaps the object to the floor)

Congratulations, the couch is now a part of your scene!