Edge

The network you are attempting to access is password protected.

There isn't much you can do. You either need to get the password from the person running the network, or find a free WiFi hot spot.

You can not access the store via EDGE.

sorry, it is a wifi iTunes store, I would assume it would not run smooth enough using the Edge network (which it does via wifi) . So without being attach to a WiFi hotspot you can not use that feature. There are plenty of hotspots in cities and towns, where do you live? Some people leave there home networks open without a password, when you look at available networks ( which will change as you even walk down a street) look and choose one with a open lock symbol not a closed lock symbol or one which you know the password.