how can i use skill...ive put my skill points and yet i cant use it...

to use a skill you need to use a combination of buttons
for example
down, side+weak atk
sometimes you need to press the special button first (if your a mage)

these vary by class
check the skill trees in the forum sections relating to char classes for the combinations

I am experiencing the same problem, after i pumped skills for mage, and tried to do the combo for the skill , nothing happens

Make sure that you have enough SP for the skills.. Make sure that you are doing the skill correctly.. And some mage skills requires the "CAST" button to be pressed first..