Customise email template for messaging system

I was wondering if any one can help with this - we have a standard email template that we manually send out to customers when they place an order, its just customised in our colours, and promotes the business more in terms of what we do -
I wanted to be able to send the same email out from Quickfile with the invoice link attached - unfortunately I know nothing about html code - I tried pasting the code into the email wrapper but I keep getting an error message and I am not sure how I can resolve it, the error message reads - There was an error with this customisation
You must include the token @EmailBody@, to indicate where the email body should be injected.