Nostalrius Begins - Quality wow vanilla realm (1.12)

ive genuinely tried everything that has been suggested, every time i try to change my realm list it says access denied and ive tried downloading that tool but it doesnt work, ive tried reinstalling but it didnt do anything, truely stuck need assistance

Where is your folder located?

Have you tried the solutions posted on the sticky thread on this forum?

Are you sure you've tried everything suggested? Me thinks you haven't read the stickies here where there's more suggestions.