i downloaded a radio app on my blackberry bold on t-mobile through appworld and when i open it comes up with a messege saying 'could not start audio stream: APN is not specified' what does this mean?

i've looked on the internet and i have been to the TCP/IP option and ticked both boxes and but the only thing on the screen for me is the two boxes and username and password and people are talking about another section where you put a web adress which i dont have?
im really confused so if anyone could help me out would be good thanks

Open options > advanced options > TCP/IP ..... What do you see? If you are on t-mobile US with a BlackBerry data plan, the APN Settings Enabled box should be checked, and epc.tmobile.com should be entered for the APN. Username and Password are left empty. If you are t-mobile anywhere else, look it up.

Also, I've had at least one app that required the carrier to be selected in the app options. See if there is such a setting in that particular app.
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