It is possible for field markers to be re-defined on any given installation of XpressDox. The decision to do this needs to be taken seriously because as soon as any significant number of templates have been authored using a particular choice of Merge Field markers, a change to the markers will require a change to all the templates authored up to that point.
XpressDox Help Center
Use Google To Find Help Fast, e.g. xpressdox choosefromlist
Press Getting Started in the XpressDox toolbar for basic template development
Watch the tutorial videos
View command help from list of commands
Press F1 for help on a command in the Command Editor
Email firstname.lastname@example.org for assistance