Thanks I get you,
Step 1:
I would need to open each PHP file using
Dashboard > Appearance > Editor
and copy and paste the contents of each file into a blank local PHP file
(Can I not download them all in one batch???)
Step 2:
Deleting the child theme I created
(Do I really need to delete it???)
Step 3:
Modify the PHP files locally
Step 4:
Upload the new modified child theme using
Dashboard > Tools > Upload Files (Destination: Theme)
(Does WP know where to put all the PHP files???)
Thanks