These are the ranks of the Order of St George and the respective Post Nominals.

Knight Grand Cross – KGCStG
Knight Commander – KCStG
Knight – KStG
Field Knight – FKStG

Dame Grand Cross – DGCStG
Dame Commander – DCStG
Dame – DStG
Field Dame – FDStG

Postulant

You may have to fiddle with formatting a little when you replace name and post nominal with your own info including phone or email, especially if you have a long name. Position may be left off.