Hi @js-webdabbler You need to implement the Target by using Adobe Launch or through at.js library.
You can check if you has Adobe Launch access, you can add Target extension in the Launch and use the launch lib on the page
Or, you can download the at.js from the Target UI (I hope you have Adobe Target access) and provide the reference of at.js on your page.
the js/lib should be in the head section.
Please refer below documentation for more details:
Hope that helps you!