Same answer.....you finish putting in one, and when you get to the W-2 table you can add another.
If you worked as a non-resident in either of those states, you will have to file a non-resident tax return for that state (if that state has an income tax)....along with a resident tax return for your home state.
IF you actually physically moved your residence to the other state, you usually have to file part-year tax returns for both states for the year you "moved".
If you are a College student going to college out of state, are a dependent of your parents, and worked in that college state, then you file non-resident in the college state for that income, and Resident in your home state. (living at college is a temporary absence..you do not "move" to the college state...unless, perhaps, you are no longer a dependent)
When you enter the information from each w-2, you will be asked for the state where the income was earned. Other than that, there is no difference (all the same). However, you may end up filing a state resident tax return for the state you live in and a non-resident state return for the state that you don't live in.