Users can add their own email signature into Spiro using both HTML and Text Formats. You need to use these two different options based on how your email client is configured under Settings > "My Profile".
To access email signature settings, go to your Settings > Templates > "Email Signature":
If you're using the "Spiro" email client, you can customize your signature using HTML to control for font, include logos and images, and add formatting. You can also copy and paste your signature directly from your outbox using this option:
If your email client is set to "default", you will use the "Email Signature Text" box when creating your signature. Simply type in whatever information you want to include in the signature, and hit save: