Step 1: Start by choosing a short audio clip by Kevin MacLeod which can be found at incompetech.filmmusic.io. Make sure to credit him properly in your media to be able to use his clips for free, as he has licenses for his music. You are looking for songs with great, smooth loops that you will be able to play over and over again.
Step 2: Once you've chosen a song, download the track, select "Choose Free License", and accept the terms and conditions. To correctly attribute MacLeod's songs, copy the given citation text and paste it into your video or into Youtube's description box. Finally, confirm that you are not a robot and hit "Download Now".
Step 3: Launch the "Adobe Audition" software on your device.
Step 4: Go to "File" > Open... > Select and open the music you just downloaded.
Step 5: Start listening to the song, pay attention to the "lead-ins" and "lead-outs" of the song, and remember you want a clean loop to use for your videos. Once you've found good starting and ending points, press the "S" key on your keyboard to place a marker in both places of the audio. Drag your mouse from the first to the second marker to highlight that portion and go to "Edit" > Copy to New.
Step 6: Click the loop playback button option 
near the stop/start and record, to allow you to listen to your clip over and over again.
Step 7: You can always edit your audio clip if you selected too much by highlighting the unwanted section and pressing "Backspace" or "Delete" on your keyboard. You can also reverse this action by hitting undo. It is important to find the balance that you need for your audio, so it may take a couple of minutes to get it just right.
Step 8: Press the "Ctrl" key, the "Shift" key, and the "S" key at the same time. This will bring up the "Save As" dialog box, from here, you can choose the file format you want to save your workbook in and rename your file as well. Make sure to save the "Sample Type" as 44100Hz sample rate with a 16 bit depth. Hit "OK" when you are finished.
If you have any more questions, please email freedmancenter@case.edu