troubleshooting label-editing user error

[rgparry]

This issue is about https://kb.x-cart.com/look_and_feel/theme_tweaker/labels_editor.html (source file: https://github.com/xcart/xcart-docs/blob/master/_pages/kb_en/look_and_feel/theme_tweaker/labels_editor.md)

It would be good if the guide could explain how to address / undo the following user behaviour, which i did in error through the labels editor and I imagine is not so uncommon :

In the labels editor I mistakenly added a styled p class to the start / end of the label.
This changed the layout of the label and meant it couldn't be re-edited in the label editor.
It would be good if the guide could explain the correct procedure or the location of the server-side file to edit

thanks for reading