- Get your image signature or text signature ready.
- If you want to use a text signature copy your text so long.
- From the File menu, select Options.

- From the Outlook Options dialog, click Mail.

- On the right side, press CTRL and click the Signatures… button.

This will open the apps folder that contains your Microsoft Outlook signatures.
- Paste your text in the dialog box or add your image
- Make sure your Compose messages in this format: shows as HTML.
- Click OK.
Your newly added email signature should show in your Signature drop-down list. You should go to Outlook’s Signatures and Stationery dialog and make sure you’ve assigned this to the proper account and if it should apply to new messages as well as replies and forwards.