Getting The Email Signature
Here is the step-by-step on how to get the Rocket.Chat email signature for your Rocket.Chat email account:
Download the HTML template signature directly from Github
Open the HTML file you downloaded with your browser and copy it.
Paste the template in the signature settings of your email.
Change the texts with your info (don't forget to change both, text displays and links).
Send a test email to a teammate to confirm that your signature appears correctly.
If you never installed a HTML email signature in Gmail you can check this video to get some additional help!