This tutorial is about the inserting your company's logo in the signature portion of the email notifications.
How To Obtain Image Logo URL
Go to your company website > Locate the company logo.
Right click on your company logo > Click Copy Image Address.
Navigate to Settings > Notification > Email Settings.
In the Signature field, click on the Image icon.
The Insert Image form will appear.
Paste the copied image URL > Save.
Note: The image link should end with an image extension, e.g. .jpg, .img etc.