Enter your wanted mp3 download into the search field above on the blue background. After entering it, click the search button next to this field.
A list of search results will appear, choose a file and listen to it by clicking the listen/play button next to your result. If the quality of this result is ok, go further to the next step.
Click the download button next to your wanted result, a save window will appear. Choose the directory where you want to save the mp3 file and click the save button on the bottom of this window.
Congratulation your download is complete, you can now go into the choosen directory and listen or open the mp3 download with your favorite mp3 player.