How Do I get perfect Transformation!

Okay, Well, I play as Vegeta, when my Power Level Is High Enough, I press "Z" and AHHHHHHHHHHHHHHH!!!!!!!!!!!!! I BECOME SUPER SAIYAN! Then, When My Power Level Reaches 5,000,000 I try pressing Z again, to Get my Perfect transformation, and, it dosent work, why? is there something else I have to press to gain Perfect transformation, it says when I'm about to select Vegeta that Transformations: Transformation 2,000,000 Perfect Transformation 5,000,000

perfect transform just mean, ur char "mastered" the transformation
or just say u need 0.00seconds to transform

Yea when youre perfect you transform in a second.

uhh does something happen when you press z at the time do you go ssj or not;/

If you're normal, you'll go SSJ, if you're SSJ nothing happens.