Lounge, not settee
It is actually the lounge that converts to a double-berth, not the settee. Remove the lower and back cushions from the lounge and take the stairs off of the cabinet. You can then carefully pull out the upper portion of the lounge into its double-berth position, and use the two cushions as the mattress. There is not a lot of room between the bulkhead and the cabinet and you have to be careful when extending the lounge. You'll also note the addiional storage space and fresh water tank inside the lounge when you extend it.