Kristina here.  The tip and trick to customizing the size of your logo and including link icons is to upload these images to your Agency Documents > Files.  I've used the Simple Image Resize tool to resize logo image, and the snipping tool to take screenshots of the desired link icons.  The next step is to upload these images by going to your Admin Menu (top right) > Profile > Documents > Agency Files.  Then these logos and link icons can be included in email signatures and email template - *remember to add the pop-out links to your link icon pics  Check it out, let us know if you have questions.