Fathi,
I never had the necessary skills to read music, however, I managed to learn most of the chords I needed to play. The best advice I have for learing is to go to
http://psrtutorial.com/Resources/R_ChordSecrets/w00_intro.html which is on the PSR Tutorial site. It has been a big help to me and many other.
Good Luck,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)