Aircraft names in PIREPs

Hello !I noticed that the ‘’St. Paul Airlines Daily Flight Arrivals’’ in the homepage shows names of aircraft that are not listed in the selectable list of planes (Acft. Code:) in the PIREP formulary. How can you show in your PIREP an aircraft that is not listed in Acft. Code:? Up to now whenever I flew an aircraft that is not listed in Acft. Code: I used to select, to fulfill the PIREP, a one listed that I found similar to the plane I used. Example: Beech 1900D selected in Acft. Code: as equivalent to Embraer 110P1 or Beechcraft B99 Commuter.It will be much appreciated any help/tip on how to show in PIREP the plane that was actually used. Kindest regards to everyone out there!!!RafaelP.D.: As a newly pilot here I need to let everyone know my sincere admiration and applause for the makers and managers of St. Paul Airlines and its outstanding website,