Step 1: Go to Settings >> Team Management and select “Edit” next to the user that you want to edit. 

Step 2: Select User Info

Step 3: Scroll down to the Email Signature Section. Type your Signature in the text box, making any edits you’d like to the text color, text size, etc. You have the option to add images or hyperlink your calendar or website if you desire. Above the text box, you can select either or both of two options- 

1) Enable signature on all outgoing messages

2) Include this signature before quoted text in replies

Step 4: Scroll down and click the green “Save” button to activate this signature.