Currently Being ModeratedNov 12, 2012 3:22 PM (in response to Aqquaman)
Instead of tapping, try using two fingers. Spread them apart to enlarge, bring them together to shrink.
Whether you tap or use two fingers may depend on which App you are in. Some Apps may not allow changing size at all.
Currently Being ModeratedNov 12, 2012 3:32 PM (in response to Aqquaman)
It's probably the app. Apple showed that feature in one of their ads so I know it does work. Try looking over the manual and see if that helps: