Romcenter

Hi, im new to romcenter ive downloaded the latest version 2.71 and the NDS DAT file from Advance-Power, Ive loaded this in and selected my rom path, and it shows the roms i have in green, but I cant seem to rename my actual files to the correct names as the FIX GAME icon is greyed out, any ideas ?

That button is available when a path or some files are selected. N/A when selecting database.