In a web browser, sign in to Outlook Web App using the URL provided by the person who manages email for your organization. Enter your user name and password, and then select Sign in.
On the nav bar, choose Settings > Options.
Under Options, choose Settings > Mail.
Under Email signature, in the text box, type the signature you want to use. Use the formatting mini toolbar to change the appearance of the signature.
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If you want your signature to display at the bottom of all outgoing items, including replies and forwards, select Automatically include my signature on messages I send. If you don’t select this option, you can manually add your signature to any message
Choose Save