lda plotting: labeling x axis and changing y-axis scale

Hi all,

I have performed an lda on two groups and have plotted using
plot(x.lda), with x.lda being my lda results.  I have forgotten how to
change the labels of the of the x-axes (they are currently listed as
Group1 and Group 13), and to rescale the y-axis to reflect frequency.
If anyone knows how to do it, I would greatly appreciate the
information.

Wade