cpa redirector 2- blog permalink problem

hey guys

(not sure if this is the right place for it but mods move if necessary)

i m trying to set up cpa redirector on wp 3.0 but not having much luck

i have done most of the things but just need to help on the blog post with your magic number in it.

so here what i put myblog.co.cc/get-a-free-iphone/?mn=76455

but it changes into myblog.co.cc/get-a-free-iphone-mn76455

any ideas on what im doing wrong ? or how i can fix it ?