JustShipIT does not require HTML knowledge to set up and edit Invoice and Delivery note templates.
To access the builder, first, create a printing profile in Settings>Printing Settings.
On the create screen you will find a button at the bottom called: 'Launch Builder'
The builder is a simple drag and drop utility, so what you see is what you get.
Once you are happy with the template layout, click Preview to see how the template will look.
If you are satisfied, click save. You will then be returned to the edit profile page where you will have to confirm and save again.