The Earned Income Credit (EIC) is calculated by the program automatically if the return qualifies for the credit.
The only way to remove the credit from a return that actually qualifies for the credit is to answer a question in a way to disqualify it (only those using the paid preparer's program are able to override the amount and still e-file the return). This can be done via the boxes at the bottom of the EIC worksheet (in the Qualifications for the Earned Income Credit section), however you should understand the IRS may question why a return that qualifies for the credit does not contain it.
To access the check boxes at the bottom of the EIC worksheet: