To add a signature to your Outlook emails, follow these steps:

Open Outlook and go to File > Options.
In the Outlook Options window, select Mail from the left-hand menu.
Scroll down to the Signatures section and select the Signatures button.
In the Signatures and Stationery window, select New.
Type a name for the signature and then create the signature using the formatting options provided. You can include text, images, and links in your signature.
Once you have created your signature, select OK to close the Signatures and Stationery window.


https://www.helpcentertips.com/blog/change-outlook-email-signature