e journal references in Jabref

[Wolfgang Engelmann]

I use jabref for LyX, biblatex. I have a larger number of e-journals as 
references. How can I change the entry type for all of them at once and 
what exactly is the entry type? Electronic? And how do I cite pages such 
as R322-R324 or III-V? This was all found by a quality check in Jabref, 
and perhaps it can be done there as a bulck? Also, how do I shift the 
contents of all Journal to Journaltitle, which is recommended for biblatex?

Sorry for the off-topic, but I thought there are others in this group 
who can answer some of it.

Wolfgang