Note: Before you can edit your email templates you will need to contact support to have this enabled.
How to add your logo onto your email template:
Go to Settings
Click Email templates
3. Once you've selected the e-mail type you want to edit, in the template editor, click on the image icon at the top:
4. Then paste the image URL in the new pop up
5. Once you are happy, click OK
6. Click on Save Template