This is optional. Your template will still work without adding a logo/header image.
1. Navigate to “Appearance” then “Customize”.
2. Next click on “Header Image” then “Add New Image”.
3. Upload your header image or choose it from the images already on your blog. Then click on “Select and Crop”.
4. The next screen at the bottom click “skip cropping”.
5. If the preview on the right looks good to you, click “Save & Publish” then view your blog.