Most critical right now is bringing your pH up. Since 6.8 is the lowest reading on your tester, it means that it could actually be much lower than that! Readings below 7.0 are acidic and can damage your pool. Go to Walmart and buy several boxes of 20 Mule Team Borax (laundry aisle.) That is what we recommend for raising pH. You didn't list the volume of the pool, so I can't comment on dosage.

Since you already have the 6-Way kit, if you go to the same test kit link I posted above, you can just buy the FAS-DPD test (Taylor 1515) kit. This will give you the chlorine test that will allow you to measure the high chlorine levels you are going to need due to your high CYA.