Betty, welcome to the AndroidForums!
There's something in your phone's settings that might work for you (haven't tried it myself, though):
menu -> Settings -> Accessibility -> Accessibility
checkbox and the Zoom Mode
Not sure if that's the ticket, though, since I found it in this thread:
But it does discuss a few other options, too.
Unfortunately, I searched the Android Market and I don't see anything obvious that actually magnify's the screen (there's apps that will magnify things through the camera, but that's not what you need).
Good luck and glad you signed-up with us here at AF!