Dp-01fx wave to mp3 issues

[Darkstar842]

Ok, I'm trying to covert my mastered tracks I've sent to my laptop (Windows 8) in a Wave file to an MP3 file. I'm not using an interface just straight USB to the computer. I'm under the impression I need to download recording software to do this. Is there anybody that has converted the wave file to MP3's and knows what they are doing?! I'm lost...