Missing liquid variables in HTML template

[StefanZ]

I've created a custom email template in Klaviyo, exported the HTML, and imported it as a template into Shopify.

To be able to use it on a segmented list, however, Shopify requires that I include somewhere within the HTML code the following two liquid variables:

{{ open_tracking_block }}

{{ unsubscribe_link }}

Unfortunately I do not know how to code in HTML and can't find any resources on what the best way to include these within the template should be. The unsubscribe link I don't mind adding as a standalone item on the bottom of the template with just "Unsubscribe" .

Any help/pointers is appreciated.