Depends on where you are wanting these to show - in the taxon field on the form, in the tree or in reports. each has a different strategy and some are possible in Specify 7 and some not (currently)
It is possible to add them to the forms by formatting your full name string in the table formatter for the taxon table but it is currently not possible to add them to the trees. You can do it in Specify 6 and it is a feature that we hope to port over to Specify 7 but not sure when. You can also add them to reports in much the same way.