This has been taken from: http://psx-scene.com/forums/wiifree-development-forum/54042-tutorial-how-compile-wiifree-yourself.html
Special thnx to Konyn for creating this tutorial.

1. Download and install JalV2. You can download it HERE:  				http://www.wattystuff.net/jal2pic/downloads/jal_v2_package.exe
2. Download the JALV21 update and install it: 						http://www.casadeyork.com/jalv2/jalv21.zip
3. Copy the extra libraries to: <JAL directory>\Libraries
4. Start JALEdit and open the WiiFreeX_XX.jal file
5. Experiment with the code/make changes
6. Press F9 to compile the jal file to .hex
7. If you made usefull changes, post them on the forum:					http://psx-scene.com/forums/wiifree-development-forum/ 