Add a logo or image to your signature

On the View tab, select  View settings. 

Select Accounts > Signatures.

Under Email signature, in the dropdown list, select the signature you want to add an image to.

Place the cursor where you want the image, then select  Insert pictures, locate your image file, and select Open.

To resize your image, right-click the picture, select Size, then choose an option.

You can also crop the image by selecting the image and dragging one of the corners.