I live in Texas but I worked a few days in 5 different states outside of Texas in 2018. TurboTax Premier will only let me add 3 states. How do I add the other 2 states?

[yodjnotifyme]

I worked 18 days in Louisiana and 1 day or less in AR, CO, LA, MO, and MS.  The rest of the year I worked in Texas.

[DawnC0]

In the Personal Info section, next to ''Other State Income'', you can add as many states as you need to.  See the image below.  You will list TX as your resident state and add the other 5 states as nonresident (Other State Income) states.  

Since you had very brief visits, you may not be required to file a return in every state.  but each state is different, so I will leave you this link so that you can determine which states, if any, you need to file a state return for.  

State Department of Revenue List