1. Log into your cPanel account.
2. In the "Files" section, click on "File Manger" Icon.
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3. Navigate to the directory where your file is located and right click on the file and then click on "Edit"" in the Context Menu.
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4. If the small "Code Editor" window is open, click on the "Edit" button, which will open a new window with options you can edit.
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5. Make changes to your file and then click on the "Save Changes" button.
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I hope it helped you!