Firstly go to the website that contains the logo you require for your email template.
Right click on the image you require and select 'Open Image in another Tab'.
Once opened in a new Tab copy the URL from the address bar as shown below
Returning to Loft please go to your email templates in the brokerage menu. Create or open the template in which you want your logo added.
Click on the '+ Image' button at the top right of the body of the email. This will add the following tag shown below -
Simply replace "IMAGE_HERE" with the URL that you copied earlier and select preview to view your logo!