Steps
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Visit the Blogger website.
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Sign in using your Google account.
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Click the "Design" tab for the blog you want to edit from your list of blogs.
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Click on “backup/Restore” button at the top right corner as shown
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Click “Choose File” to upload a template from your hard drive.
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Browse for your compatible .XML template and click open.
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Click “Upload”
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After Upload template will be changed