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Make sure you have permission to use the picture you are linking to. Paste your image's URL and click the blue Insert Image button.Click the Image icon from the formatting toolbar.Note: The image must already be available on the internet as a link, as it is not possible to upload a file into the signature editor. You can insert an image into your signature by following these steps.
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If your default message format is not set to allow rich text formatting and you would like to enable this, you can do so by going to Settings → Signatures & Compose → Compose options. If your default message format is set to allow rich text formatting, the signature composer will show a formatting toolbar, allowing you to change fonts or colors and add links.
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