when filing my w2s box fifteen needs a state which happens to be TN. In the drop down box Tennessee isnt even listed how do i bypass that?

Several  states do not have a state income tax.  So these states will not show up in certain drop down lists.   Leave boxes 15, 16, and 17 blank when you enter a W-2 for these states.

Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington and Wyoming