The current limit is set when the charger is made and doesn’t normally need to be adjusted. However, it can be adjusted using the preset pot marked I-LIM. Connect the charger to a recently discharged battery, or one that draws more current than the charger’s current rating. Then connect an amp meter to the charger output, switch the charger on, observe the current reading. The charger must be in current limit when adjusting the I-LIM or the adjustment will have no effect.