You should be very careful with using scripts for your contact form. The 'animated form' linked above may look nice, but it has no security checks whatsoever. That's like leaving your house door wide open.
The code above by 'Cats Who Code' is a lot better, but since you don't seem to have coding skills, I strongly advice to use a simple (but secure) contact form plug-in (as long as it's not Contact Form 7...).