Get your taxes done using TurboTax

I changed the original numbers on my W2 to show the corrected numbers on the W2c.  I tried to put the information on the W2c in the income file.  This caused all kinds of incorrect information to appear on my tax return.  Confused about the correct way to change the original information on the original W2.   Can you just do the correction without adding the W2c to your income tax return?