Missing MMS Option

[Late85js]

I'm on metropcs. Thanks you very much for responding but that is the same file that I download. After downloading the cab file I do this start-> file explorer -> Metro wap/mms cab-> install. What I get is a page on internet explorer that tries to load. I do a soft reset and then I go to task manager--> regedit and change the keys and values. My problem is with changing the registry, I really don't know if I'm doing it right or wrong. Can you help me with that. For example when I'm in the regedit what is the value that I put for "Connect via: SELECT THE CONNECTION YOU SETUP ABOVE".