Open Outlook
Go to File
Select Options
Click Mail
Click Signatures
Select the signature you want to change
Edit the signature in the text box
Click OK
If needed, choose the updated signature for New messages and Replies/forwards
Click OK again
Open Outlook
Go to File
Select Options
Click Mail
Click Signatures
Select the signature you want to change
Edit the signature in the text box
Click OK
If needed, choose the updated signature for New messages and Replies/forwards
Click OK again