F1 2010 Switching engines?

[Kris Cabrera]

hey guys i was about to switch my engine out for my race because i want to use one engine for practice and qualifying, but i didn't want to switch it out right before the race because i was scared of a penalty. Is there somewhere were you could switch it out before the race??

Or if i am doing it totally wrong what would be the best way?

Thanks!

 

[Suomalainen]

So, I join this question!
Please answer.