This is difficult even when done from the PC. I noticed things I wanted to changed on songs I transferred from the "Windows Phone App for PC," so I went back into WMP and edited the songs to match what I wanted. After trying to sync again with the updated the info, the program completely ignored the changes I made and left the song tags the same as they were. The only way to fix this was to delete all the songs off the phone, and re-upload with the new info which took forever on USB.
I know the software is new and you can't expect all the features yet but hopefully they get this stuff fixed soon because it's too much of a hassle just to do some simple things. With that said, I'm not sure if there's an easy way to this from the phone but at least now you know what to expect when using the PC.
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