Hate:
You need a DAW on your computer . (garageband , cubase , logic , audacity ) the basic DAWs pretty much have the same concept . Just watch some tutorials on how to use it on youtube or something . Just drag the audio/background music file into the workspace , and start a new audio recording track and start playing . Export the file to whatever format you want .
if you want to record two things together at once by plugin/miced .. then the UX1 is not enough .. you prolly need presonus firebox or any audio interface that has 2 or more inputs .