1. Take an original song (you own or have the rights to) and export 16 x Mp3 loops from the mix stems, of between 1, 2, 4 or 8 bars each. (see: How to make perfect loops using Ableton Live)
Here's an example of 16 loops that make up one HitPads Remixer:
01: kick drum - 1 bar loop
02: Snare drum - 1 bar loop
03: Hi Hats open - 1 bar loop
04: Hi Hats closed - 1 bar loop
05: Backbeats - 2 bar loop
06: Crash symbol - 4 bar loop (with crash on the 1st beat of the 1st bar only)
07: Bass part A - 2 bar loop
08: Bass part B - 2 bar loop
09: Synth A - 8 bar loop
10: Synth B - 4 bar loop
11: Hook 1 - 2 bar loop
12: Hook 2 - 4 bar loop
13: Buzz/sweep/white noise - 8 bar loop
14: Vocal part A - 2 bar loop
15: Vocal part B - 4 bar loop
16: Vocal part C - 8 bar loop
2. Upload your 16 x Mp3 loops and your CD-cover art to a new HitPads Remixer
3. Enter some descriptive information like Song Name, iTunes buy URL, tags, etc