There are instructions on the bottle if you need more help, but all you need to do is spray 10-20 sprays per square foot of your carpeting on the stain/urine.
Let the product sit and it will begin to break down the bacteria starting immediately.
There is no need to come back and dry up, or scrub (unless you are using it on heavily stained areas.)
Just allow it to dry in your carpeting. If any stains/smells remain after 45 minutes, simply reply another application! Repeat as needed :)