My W-2G does not have a locality name in box 18 of form turbo will not let me get past this

[DoninGA]

There should be no entry in box 18.  If you left it blank (empty) and the program still requires an entry then delete the Form W-2G and re-enter the form manually.

[Critter-3]

If box 16 is blank or a zero then leave boxes 16 - 18 blank in the program.

Same for box 14 ... if it is zero or blank leave boxes 13 - 15 blank.