Step 1. Click ‘Settings’.
Step 2. In the ‘Settings’ pane, click ‘Identities’.
Then click the account you would like to create a signature for.
Step 3. Enter your email signature in the ‘Signature’ text box.
Step 4. If you primarily send formatted (HTML) messages, you can enable the HTML signature option which allows you to add formatting of your signature.
When the HTML signature is selected the ‘Signature’ text box will display a formatting toolbar.
Step 5. Click ‘Save’.
Step 6. In the ‘Settings’ pane, click ‘Preferences’ and then click ‘Composing Messages’.
Step 7. In the ‘Signature Options’ section, choose the option from the ‘Automatically add signature’ dropdown list to specify how you would like to display your signature:
Never - Do not display the signature.
Always - Display the signature in all messages, including new messages, replies, and forwards.
New message only - Display the signature on new messages, but not in replies or forwards.
Replies and forwards only - Display the signature in replies and forwards but not in new messages.
Step 8. Click ‘Save’.