Open Outlook
Click File
Click Options
Click Mail
Click Signatures…
Under Select signature to edit, choose the email account and the signature you want to change
Edit the signature text in the box
Use the available formatting tools to update fonts, sizes, links, and images
To set the new signature for new emails, use the dropdown under New messages
To set the new signature for replies/forwards, use the dropdown under Replies/forwards
Click OK
Close the Options window