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File to edit: wp-config.php
Open the file and search for DISALLOW_FILE_EDIT to see if you have the line already.
If not paste, paste the code just before /* That’s all, stop editing! Happy blogging. */
define ('DISALLOW_FILE_EDIT', true);
then save the file
If you want to temporarily allow file editing, you can simply replace ”true” with ”false”.Change it back when you are done editing.