You have not screwed ANYTHING up, you are doing good.
1) Adding 7 more lbs of Chlorine stabilizer should get you to 30 CYA. This is where we want you to be. You already added 1 lb, just add 7 more in socks. Let them soak and squeeze when you can, keep pump running.
2) Read and start the SLAM process. Print these instructions out and follow them. Ask any questions:
We’ve all had to deal with a green pool. Clear algae from your pool with a SLAM! Read here to use shock level and maintain to clear your pool.
www.troublefreepool.com