How do you add SEO HTML to my pages?

Hello, 

I'm currently paying for SEO HTML codes, but I don't know how to input them. My first thought was to go to page builder, create a new HTML block, and making it invisible. Unfortunately, that didn't work... I also tried to input the code by creating a banner because the code says to put it in the head of page. What am I missing? If someone could walk me through this, you would be my hero! 

Thank you for your time, 
Rachel
www.artb4commerce.com

That's currently limited with D7, you have a place in the admin for the general site stuff.

Not for each page.

Deano offers a module on the market and maybe someone else does but that all will change with the upcoming releases; Trident does it already.