how can i choose whether i want files to be stored on a media card or device memory when I recieve a file via bluetooth

You have to navigate to that folder first and then hit the menu key and select "receive using bluetooth." Then send from the other device. The file will be sent to the folder you were in when you selected "receive using bluetooth."

I know but i mean when u navigate which folder you want it to go too how do u naviagte if you want it to go to the media card or the phone memory

Navigate as far backwards as it wil let you and you have two options to choose from. Media Card or Device Memory then move forward to the folder you want.

You are not understanding my question. lets say you sending me a song via bluetooth how do i configure where that song goes , in eaither media card or device memory ?

They're understanding your question perfectly.
You are not understanding their answers... which are correct.
Please read the responses carefully.

All the information is right in this thread. Really no further detail from here. Give the above a try.