Hi Mimi;

Your CYA reading is 0, which explains why the dot didn't disappear . . . and also why you can't keep chlorine in your pool. You need to add chlorine, add stabilizer and lower your pH. Dichlor will do all three, though you'll probably still need some acid.

If you have a Sams Club nearby, get some of their bagged dichlor; otherwise order the Kem-Tek from Amazon. You may be able to find it locally, but do NOT do that yet, because most locally sold dichlor is blended and diluted goo -- you need to be an expert 'chemical label inspector' before you try to purchase locally (except for Sams!).
24 lbs PoolBrand bagged shock @ Sams Club
Kem-Tek Dichlor 22 lbs @ Amazon
Keep adding 1 gallon each PM till you have the dichlor.

Also, your Pool Chart reading didn't take; I don't know why. But it goes to a spreadsheet that I and the moderators can see. However, we're in the middle of transferring much of that data to individual member signature, so we'll be able to see your pool info, each time you post a question. SO . . . . if you would, please have another go at completing it.

Finally, take a look at the muriatic acid page linked in my signature; with a pH of 8.2, you probably need to read that, as well.

Good luck!