How and where to paste my Facebook pixel event code in my webpage?

I have added Facebook pixel base code successfully in my webpage. I have some doubts while installing pixel event code. I copied below pixel code for "Addtobasket".

<script>
fbq('track', 'AddToCart', {
value: 3.50,
currency: 'USD'
});
</script>

I want to know where to add this script and want to know purpose of having this condition (value: 3.50, currency: USD)

I'm running a Indian shopping portal it's currency is INR. Can I remove the condition and simply add like below???

<script>
fbq('track', 'AddToCart');
</script>

If i use code like this whether it is possible to track how many peoples made "add to cart" in my page.

And tell me on which page I have to add this script??? either in home page or each and every webpage???

Thank You

 

You should contact the author or creator of the script.

 

Typically scripts would go into the header section of your webpage. But as Belaback above had mentioned, I would reach out to the author of the script in case it has unique requirements.