Hannibal

I recently purchased an RP91 because of its advanced capabilities with
anamorphic and non-anamorphic DVD signals and my widescreen HDTV. It is
supposed to have every feature known to mankind. Last night I was
experimenting with it, trying to get it to zoom, or enlarge, an image from a
DVD. I spent at least a half hour messing with this and reading the
manual, but found nothing. I have owned two previous cheap DVD players,
both of which had this feature. What am I doing wrong?