Unable to edit php code

Hello,

I saw the screenshot you attached.

This issue is related to WordPress, not the theme. Please try making changes to the file using FTP or Cpanel.

Or you can read the following article for help:
https://stackoverflow.com/questions/52671255/wordpress-editor-not-updating-files-unable-to-communicate-back-with-site-to-che

Regards.
Xtemos Studios.