Be sure you've already inserted an image. For instructions on how to insert an image, please visit the article 'How do I add an image to my email signature?'.
Select the image by click on it. Then click the chain link icon
URL: Enter the URL you want the viewer to go to if they were to click on the image
Text to display: Leave Blank!
Target: Select whether you want the webpage to open in a new window / tab (New window) or in the same window (None). We recommend you select 'New window'.
Click OK and then Click Save.