I see now. 'Just Explore a Scenario' does not allow you to fire. It is meant to just fly around and find out where everything is to plan ahead of a mission/scenario or when you are not in the mood for a fight...
I think it should recall your last pilot name unless it cannot access the files under that folder C:\Users\<your windows user name>\AppData\Local\SQ1\
Thanks for playing the game. I hope you have fun!
