You are correct, I looked up the manual, and it provides no help. When I added a pressure tank to our water system (back up North), it had what looked like a tire valve stem on the tank which was used to set the initial pressure. I am GUESSING there is a similar valve on the storage tank, it may be hidden. If you can find this valve, a small compressor should be able to provide the 6 PSI, I have one of these if you do not have access.
Look around the storage tank, see figure 13, page 12, I think the valve you are looking for is near the bottom of the tank.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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