If you entered your W-2 and other information correctly then you might have not enough taxes withheld from your paycheck. You might want to check your withholdings settings in mypay. Please go over all your entries to verify that you entered everything correctly.
The IRS Tax Withholding Estimator might be helpful to calculate the correct amount of withholdings in the future.
If you like someone to look over your return please see What is TurboTax Live? (please be aware this is not free).