Simply click on "Add another C-FBYP" at left side of page, and follow instructions.
Adding aircraft is a 2 steps work. First you add or find an airframe, then attach a registry number to the airframe. In first step, after you type in Manufacturer and Model info, a list of existing airframes with same model will show up at right side. Go through the list first to see if the airframe already exist in database before continue inputing airframe info, to avoid duplicated airframe records.
Ken