changing directory

i’m trying to add a /blog directory. i’ve followed directions from here: http://codex.ww.wp.xz.cn/Giving_WordPress_Its_Own_Directory but still not working. when i go to login i have to go to /blog/wp-admin/index.php and i figured i’d just have to go to /blog/wp-admin i’m really hoping it’s something silly i’m just not doing but i cannot figure it out for the life of me. i’m a real noob to all of this so the simpler the answer the better. thanks in advance!