howdy Bigdog and welcome to the forums!

the reason you cannot type in the wow username and maxfps fields... is because you did not select the right program in the 'program...' field. this was done on purpose in order to give a hint to the wow user that something isn't right (a popup warning doesn't make sense, as there are other games besides wow...)

you must select the wow application (wow.exe) NOT launcher.exe. once you select wow.exe the fields will be enabled.

if you are still having issues, please feel free to drop me a note.

have a great day,

Rob