How can I delete newsletter sign up pop up and revert back to the default for Debut Theme

[jenjohn]

I did not write down where I put the code for the newsletter pop up that I created in Convertkit for my store.   Unfortunately, I deleted the form on convertkit thinking that would remove it, but clearly the code still finds that form.   How can I change the code back to not make that subscription request pop up? It isn't user friendly on mobile so I want to take it out.  Thanks