Adding the code to my website

I have added the doctype html to the top of the script and this is still the message that I recieve on my website. I am using squarespace. I even trialed changing the loading to java script vs html.

THIS IS THE MESSAGE.

Could not properly render your SpreadShop!

This HTML Document does not specify a doctype. This can lead to very strange layout and styling errors.

Please add ‘’ at the beginning of your html file.

Can anyone help guide me on what to do?

This is how I have it listed on my website below.

phireflo