You can purchase CYA aka Stabilizer aka Conditioner at Walmart, Home Depot, Lowes, Amazon, Pool stores, etc.
If your initial test at least made the dot 'grey' it means you have some in the water. Most likely the 'shock' and 'brite sticks' were dichlor/trichlor which are chlorine and CYA. So add 20 ppm CYA granules using the sock method.
Add the CYA by using what we call the sock method. Get an old sock (no holes) and put the measured amount of CYA you need. Tie the sock closed and either suspend it in front of a return (hang it from your brush pole works with something weighted on the deck) OR if it still allows flow thru the skimmer, place the sock in the skimmer. Every 15/20 minutes give the sock a squeeze to speed up the process. Please DO NOT follow the directions on the container of CYA to just pour it into the skimmer and don't just toss the sock in the pool as the CYA is acidic and can bleach/stain pool finishes.
For FC, once you start the CYA dissolving, add enough liquid chlorine to get to 12 ppm. You can get liquid chlorine at Walmart, Home Depot, Lowes, pool stores, farm stores, cleaning supply stores, etc. Use
PoolMath (you have the app). Enter your most current test, include the expected CYA of 30 ppm, go to Overview, touch the FC, select SLAM, and see how much liquid chlorine (you must select the %) it states to use. You will then test your FC and add liquid chlorine multiple times per day until you pass the three criteria described in the SLAM article.