Watch this screencast or follow the step-by-step tutorial below.
To add or edit a signature in Outlook, go to the Outlook menu and select Preferences.
In Preferences, find the Signatures icon.
Check the box next to Standard and type in the area at the right, or add a new signature by clicking the plus button at the bottom right of the window. Use the format menu at the top of the screen to format the text.
Click the Default Signatures button and use the drop down menu next each account to choose the signature for that account, click ok, and click the red box to close out of the signatures window.