Return to the Income section of the return and add a W-2 for your new employer (if you haven't done so already). After adding the new employer, just delete the w-2 for the old employer for whom you no longer work.
Unfortunately, this did not work. In 2015 I worked for employer A. I removed the W-2 for Employer A, then added Employer B. When reviewing everything, there is a line item showing Employer B and income for 2015 and 2016. However, I never worked for Employer B in 2015, but it is a salary in the 2015 column in Employer B row.
It is there for comparison purposes, you can compare your 2015 W-2 income to your 2016 W-2 income, even though you didn't earn it from "employer B" in 2015.