HTML templates can be edited if you:
Click Options and then click Document Manager.
Click Html Templates and click Edit for the template you need to change.
From the Html Template Editor click the HTML tab.
In the body of the editor is the HTML code that goes to make up the template.
If you need assistance to edit these a case with our professional services team will need to be raised. Please speak to your Customer Success Manager or Account Manager to arrange this for you and provide details of what it is you want changed.