Still use 10 gallons? Sorry I’m a dumb dumb with this stuff! Still learning
Buy 10 gallons, then follow the SLAM process. Here...link-->SLAM Process
It may take more than 10 gallons, but that gets you started.

The first part of the test if FC, which you said was 11. The second part is CC. Is that 1? Ignore and don't report TC. Doesn't matter.
 
@PoolStored made a good catch, that I missed, about that Dollar Store bleach. If you've already put it in, repercussions will probably be very little, but no more in the future, ever.

No, don't put the whole 10 gallons in at once!

Use PoolMath and from the Overview screen, tap on the Free Chlorine.
  • Make sure your pool volume is correct
  • Enter your current FC reading - test just before you do this. (I used 11 from the reporting above)
  • Make sure the CYA amount is the same as your last test. (I used 60 that was mentioned above)
  • For target Level, check the little circle that says "SLAM"
  • Pick the correct Sanitizer Type, and the Percent on the new jugs you just bought. (I used Liquid and 12%)

It will tell you how much to add. In my example, it would be 2 gallons and 3 quarts.

After 2 hours, retest FC, and use this number as the new "Current Free Chlorine" amount, and repeat.

Understandable if every 2 hrs can't be done (nighttime, work, etc.) The more often you can keep repeating, the sooner the pool will clear. As time goes by, the amount you have to add will get less and less, as will the time between tests.
During all of this, turn your SWCG off, and pump running so it keeps mixing what you add. While waiting, brush, vac, and check your filter - it will likely need a lot of repeat cleanings as it gets the stuff you are killing. Take a picture once or twice a day, so you can review and see that it is actually getting better.