You can manually tell the ACE system to shock the spa by pressing a few buttons. If you have some chlorine on hand it won't hurt anything to add it into the filter compartment (as long as it is the correct type of chlorine for spas)
Is there a manual or link on HotSprings site that explains in detail how the ACE system works and what chemicals one would still need to utilize for a proper hottub balance...
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Your dealer should have given you the manual. However, to shock the spa temporarily with the ACE system:
Options > Water Care > Boost. Then it will ask you if you really want to boost the system... say yes (obviously!)