Inserting JavaScript into Dawn theme file

[TriTexCreations]

Hi y'all,

I'm using the Klaviyo app on the Dawn 15.2.0 theme. I want to insert some JavaScript to make Klaviyo's sign-up forms more accessible to JAWS screen readers. I'm told to put the code into the main theme file, but which file is that for this theme? Theme.liquid looks like it may be it, but do I have to wrap my Javascript in HTML or something?

Thanks in advance!

Blessings,

Mark