To find that variable, click ‘Preview & Test’ in the top right corner. There you will find all of your variable data that you can copy into the area you screenshot. You’d just need to find the one labeled for product image source.
Here are some guides on it:
https://help.klaviyo.com/hc/en-us/articles/115002779071
Depending on your integration and trigger of your message, the variable could be:
{{ event.extra.line_items.0.product.images.0.src }}
But that depends on the trigger metric of your message/flow.
If this is only a campaign send with no trigger metric, then there won’t be dynamic event data to feed into this message.
I have a question, what if i have a “for” loop for a Purchase Confirmation flow where I show all the products purchased, I want to show the image of each product dynamically, not specifying it to be “0,1,2...etc” how do I do that?