If you entered two W-2's for the same employer, with the same EIN, then return to Wages & Income and delete one of the forms.
When you get to the State Taxes section (Boxes 15-17), enter the information for both states (income and withholding) on just one W-2 even if you received two separate forms from your employer.
You can add more lines/boxes if necessary by clicking on the link "+Add another state".
See this help article for more information.