How to unlock 3rd slot in candyworks? : rDotA2

unlock 2nd insured slot dmz - V 7 unlock slot How to UNLOCK the 3rd INSURED SLOT EASY and SOLO unlock 3rd insured slot dmz How to UNLOCK the 3rd INSURED SLOT EASY and SOLO

unlock second insured slot dmz I don't understand why, but whenever I click the lock hotkey, it makes the sound effect but doesn't actually unlock the slot