Where to find your signatures depends on which Outlook you use:
- Outlook app on Windows: File, then Options, then Mail, then Signatures.
- New Outlook for Windows: Settings, then Accounts, then Signatures.
- Outlook app on Mac: the Outlook menu at the top of your screen, then Settings, then Signatures.
- Outlook in a web browser (outlook.com or Microsoft 365): Settings, then Accounts, then Signatures. On some older versions it is under Mail, then Compose and reply.
Add a new signature, paste yours into the box, and save.