How to install signature in Outlook (Mac)?

On the Outlook menu, Go to Preferences.

Under e-mail, click Signatures Preferences button .

Click Add.

A new signature appears under Signature name, with the name Untitled.

Double-click Untitled to rename it with your desiered name for that siganture. This name is only for your reference.

Now open signature file and copy paste signature from browser in right panel box.