Inserting JS Plugin into a page

Hello,
I have been trying to wrap my brain around the instructions and I am just hitting serious dumb brain moments. Anyone help?

Client is paying for a realestate plugin that shows their listings on a page. Realestate link sends their instructions that look like this:

I am completely unsure where to insert the js code.

I IMAGINE it needs to go in a box somewhere on a template page, and then i need to make buttons that link to the sample links after website/#/search/gallery

but then i am getting confused as to how the link knows to use the page with that JS plugged into the correctly designed section of the page.

Any help is appreciated.

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