Couple of options:
- in the edit code --> whatever footer.liquid you changed you can look towards the top left of the actual code page and see this:
Option 2: make a backup of your theme --> Online Store --> Actions Drop down --> Duplicate (then download and add the debut or whatever theme again) once it is downloaded, select edit code on the theme you downloaded --> find the same file you just edited and copy all of the code from this file. next, go to your existing them --> edit code and go back to the file you edited footer.liquid or whatever you were editing and paste the original code you just copied.
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@Tjchris17 - in the edit code footer.liquid file you changed you can look the top left of the page and see this: older versions click on this see