Click the Signatures tab at the top of the Mail preferences screen. Select Mail in the menu bar and choose Preferences in the drop-down menu to open the Mail preferences screen.
Click “Ok”, close “Preferences” panel and you're done! How to Add Links to Signatures in Mac OS X Mail or MacOS Mail. You can also use the shortcut “Command + K.” 5.
How to add images & links to MacMail signature (1-min guide), ” and enter the URL into the box. Add hyperlink to image in mac mail signature
