There are two different ways to add an HTML signature to your email, and which one you use depends on the program you use to send and receive emails.
GMAIL (or other similar email program):
1) We should have already sent you a link to your HTML Signature code. Please click that link and visit the page.
2) The link should bring you to a JSFiddle.net page with the screen separated in four quadrants, similar to the image below.
3) Copy the signature in the lower hand right quadrant. Make sure to select the entire signature area with your mouse, then if using a PC, hold Ctrl and C to copy it.
4) Now go to your Gmail and login. (https://gmail.com)
5) In your Gmail account, click on the Gear Icon then on "Settings".
6) On the settings screen, scroll down until you see the large Signatures box area.
7) Click inside the box, then if using a PC hold Crtl and press V. This will paste your HTML signature into the area.
Ensure it looks correct. You can add other details such as your name, phone number, or other details as required.
8) Scroll down a little further, and click on the "Save Changes" button.
Your new GatherKudos signature is now saved, and will appear at the bottom of each of your emails. This is an important step in letting your customers know about this service.