Back to Stock integration with Testament Shopify Theme

Hi everyone,

I’m brand new to this forum.

I am delivering a series of flows for a client but I’m struggling with the Back to flow one.

I have have read the following article but unfortunately, I can’t seem to be able to move ahead.

https://help.klaviyo.com/hc/en-us/articles/360001895651

While she gave me access to her theme, I can’t seem to be able to edit the code. (see below). On her side, she doesn’t seem to be able to find find.liquid, what are we missing? Is the theme testament any different than the other themes? Is my shopify access restricted while I do have access to her theme?

Help...