When using L2Walker try running this script.. Other wise I don't know how to auto use mana pots.
Code:
//
// Mana Pot Script By AdlerBR
//
Label(INICIO)
CharStatus(MP,<,60)
{
Label(MANA)
USEITEM(Mana Potion[ID=728])
DELAY(500)
CharStatus(MP,<,70)
{
Call(MANA)
}
}
DELAY(1000)
Call(INICIO)