how do i test admob if it works. how do i adjust size for admob or how it appear

i saw a tutorial on ads for android

http://www.stencyl.com/help/view/android-ads/

and added admob codes in my game.

however,  how do i know if it works? is there a way for me to test the admob? i dont want to upload not knowing if it works or not.


also, how do i adjust size for admob or how it appears?

thank you

Try http://community.stencyl.com/index.php/topic,41376.0.html