Please navigate to System Settings / Document Templates (subject to user permissions)
Either create a new template, or select edit against an existing template, then navigate to the panel below:
The above drop-down allows you to set when this system template should ALWAYS request an e-signature, it is optional but defaults to OFF or it is optional and defaults to ON.
By selecting one of these three options, the panel will expand with the following fields:
This will allow you to create a personalised message to your email recipient, along with the use of merge fields, should you wish to reference the product details e.g. lender and lender reference.