crosshair scrip not working

Hi! I have the cross hair script from the first person pdf file from unity, and Created a cross hair from paint (windows 7) and I assighed it, but when I hit play, the crosshair is to big to see around, and I cant see through it. what should i do? thanks for your time

Add an alpha channel to your cross-hair image so that you can see through it, and change the size of it in the inspector.