Hi Pat,
You can open the aircraft cfg file (the text one) within the Aircraft folder, using wordpad or similar.
Scroll down and in the aircraft ebtry you'll find;
description=just enter what you desire after the = sign.
For the performance scroll further down 'til you see;
[General]You should see;
performance=in that section and you can add to this part also.
If there is no sign of either entry, just type them in yourself in the appropriate places and remember to save before exiting
Cheers
Stewart B)