Help with adding Adwords code to a site

Hi,

I'm new to squarespace. I don't know much about website building, html, css, or anything of that sort either.

My Adwords manager has told me to add event snippets at the end of the form (after someone fills it up and see the thank you message).

He's also told me to add global site tag in the header and a google analytics code.

I'd appreciate some guidance on how I could do that. I can't seem to find the option for these things anywhere. Thank you so much!