How do I create a new signature?
The best way to create a new signature is to clone a signature that is currently in the account. Use this clone as the foundation of your new signature.
Edit the Cloned Signature
One thing to note:
We recommend uploading images at 2x the image size in the HTML. For example, if the image width in the HTML is "120", upload your image into Images (Marketing drop down > Images) with a width of 240 px for recommended retina resolution. If the height of the image that you uploaded is 100px, you will need to adjust the height in the HTML to height="50" to keep the image proportional.