Hi
I think it's better to start with the examples in which you could find the different options to manage data, boundaries ...
With a carefully reading of the user manual, this will learn you how to build a sterring file and also how to put a boundary condition varying in time.
For the first question, I imagine it's link to fudaa. Some name are not necessary well chosen. Editor is for Preprocessing, Post is for Postprocessing.
Regards