Just purchased a Android tablet 2.2 I am having a hard time plugging in the AC power adapater into the tablet should I just press harder? Goes in about 3/4 of the way.

If the tablet says it's charging then don't worry.
Best NOT to force these things as you may break the actual connection.

I have an Android 2.2 tablet and the power adapter only goes in 3/4. As long as the red light comes on,it is charging.