If you are using external FLAC compression, this is how you do it:
Hit EAC on the top menu, then Compression Options. Select the External Compression tab and about half way down is a line for Additional command-line options-you fill in what parameters you want there.
Here's what I use in that space, it works but may be over kill for what you want (cut and paste the following in if you want to use it):
-8 -V -T "ARTIST=%a" -T "TITLE=%t" -T "ALBUM=%g" -T "DATE=%y" -T "TRACKNUMBER=%n" -T "TOTALTRACKS=%x" -T "GENRE=%m" -T "ALBUM ARTIST=%v" -T "ALBUMARTIST=%v" -T "COMMENT=EAC V1.0 beta 1, Secure Mode, Test & Copy, AccurateRip, FLAC -8" %s
Others can probably explain a whole lot better than I can what each of the above means.