Remap 'Eject' key to 'Forward Delete' on Mac

I've been trying to program on me Macbook Air for a few weeks. The keyboard is really unacceptable on this laptop and I really prefer to use my HP with a real keyboard that my Mac. But, my HP is fat... too fat and I let it at home. So,  I need to find solution to work with this ugly keyboard.

Today,  I decided to remap the unused 'eject' key to 'forward delete'(why is there an 'eject' key on a Macbook Air???? There's no DVD player...).

To do that, you have to install and configure two free softwares :

Each software will need to restart the system.