Change score tempo of an imported midi file

This may be a stupid question, but I haven't found an answer.
I imported a midi score that has a tempo set. I want to change the score tempo but don't know how. I do know how to start playback and arrow up/down the tempo, but I don't want to do that; I want to change the default score tempo.
Any directional assistance available?
Richard
I imported a midi score that has a tempo set. I want to change the score tempo but don't know how. I do know how to start playback and arrow up/down the tempo, but I don't want to do that; I want to change the default score tempo.
Any directional assistance available?
Richard