If in doubt, rt-click on the terminal and select create Control or Constant. I've attached a quick-example that should point you along. Basically the input is an array with strings as the elements.
Ed, This is a correction to my answer of 8/4. (don't know what I was thinking yesterday...). This corrected example shows how to create the constant array you ask about. Its done on the block diagram with strings, then through a build array, then input to terminal of said VI. I put some test data in the attached with another explanation to show. Doug