Set up an email signature in Outlook Online


Log into your Office 365 account and go to the Mail app.


 The Mail app in Exchange 2016 OWA


Then, go to the settings (it’s a gear icon at the top right-corner of the screen) and click Mail


Go to the Option section in Outlook on the Web.


On the left pane, under the Mail section, then Layout, select Email signature. 

 Go to the Email signature section in Outlook on the Web.


Copy signature from your Outlook Desktop and paste in text box shown below. Be sure to click Automatically include my signature on new messages I Compose. 


Use available formatting tools to create your email signature in Outlook on the Web.


Once your signature has been added, hit the Save button so that all changes take effect.


Click the Save button to submit all changes in your email signature.


Confirm results by opening a new mail message.


Click the New button to open a new email message in Outlook on the Web.


Done.


Your email signature is already inserted to a new email message in Outlook on the Web.