I need to add code to my functions.php file because every time X is updated, I need to change the functions.php file. I understand that I need to update a child theme.
When I go to the dashboard and view the active themes (Appearance > themes), I see that there is already an active X child theme? (Please see red circle on attached image.) Do I update this one? If so, where do I add the functions.php code? I clicked customize and I only see where to add CSS code.
Also, please see the green circle on the attached image. This looks like the X theme but why does it say Activate when the X theme is already activated?
PLEASE, PLEASE, PLEASE help.