Okay, if you use the file manager in cpanel, you would navigate to the file you want to edit. If the file is includes/configure.php, you will need to navigate the left-hand folder view to get to the includes directory. You should see a modules folder and a templates folder at the bottom of the folders listed in the right-hand panel.
Scroll down till you see the configure.php file. All the way to the right is the permission for that file. It is probably set at 444 while all the others around it are 644. The difference? 644 can be changed: 444 is "locked".
Click the iccon next to configure.php and it will be highlighted. In the top menu, find Permmissions and click on that. it will show you a representation of the current permission settings. In the case of EITHER configure.php file, you will need to make sure that the file is 644 to edit and then returned to 444 after editing. Simply click the spot for User Write and the numbers will change to 644. Now you can edit and save the file.
When you're done, be sure to change the permissions back to 444. Just un-check the User Write.
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