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In classic Outlook, select File > Options. Then, in the dialog, select Mail > Signatures.
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Select New, type a name, and select OK.
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In the Edit signature box, compose your signature and select Save.
To set your new signature as default, select the drop-down box next to New Messages or Replies/forwards under Choose default signature, and pick your new signature.
Tip: For more info on using signatures, see Insert a signature.
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In new Outlook, on the View tab, selectÂ
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Select Accounts > Signatures and choose  New signature.
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Give your signature a name, and then type your signature in the editing window. Use the toolbar in the editing window to format text or to add an image.
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Select Save when you're done.
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With your new signature selected in the dropdown list above the editing window, go to Select default signatures and choose whether to apply the signature to new messages and to replies and forwards.
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In Outlook for Mac​​​​​​​, select Outlook > Settings > Signatures.
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Select  (Add a signature).
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In the Signature window, compose and format your signature, then give it a name in the Signature Name box.
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On the title bar, select  (Save), then close the window.
Tip: For more info on using signatures, see Create and add a signature to messages.
