Nventree no longer requires HTML knowledge to setup and edit invoices templates.
To access the builder, first create a printing profile in Settings>Printing Settings
In the create screen you will find a button at the bottom to Launch Builder.
Once in the builder, you load an existing template or create a new one.
Specific options are located on the left side menu.
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.