An email signature is something that is displayed at the bottom of each outbound email. To add an email signature to your user profile, open your user profile by clicking Edit My Profile from the top toolbar.
This will bring you to your user profile page. Scroll down the page until you see an ‘Email Settings’ heading.
Click in the text edit box adjacent to Email Signature. Here, you can add any information that you would like to include in your email signature.
Make sure to click the 'Update Profile' button near the bottom of the page to save your changes when you are finished.