de pampi, any advise?

everything seems to be working ok, i can get a list of the shared(watch folders) on the unit, but when i press play nothing happens. i set up the dsm-520 as a media adaptar(upnp), it just doesnt seem to be talking to the dsm. i saw in another post something about a wireless access point, i just have wireless router, do i need to buy a wireless access point? if so, how can i set that up?

also, maybe a run down of how to set it up correct to hit play on the remote and it play on the tv via the dsm-520. do i have to run the pmm and dsm software or just the pmm, or just something like twonky.

tia