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Get a solid Taylor test kit like the K2005 or K2006 https://a.co/d/0jkTTdee Makes life easy when you have good info
I think the pool store only gave you half the story. They told you what to do on that exact day, but not what you need to do to actually get it clear. You should be adding chlorine every single day. You want to get the level up to ~25ppm, check it daily and add what you need to get it back up there. With that much algae the level will drop noticeably in 24 hours. Chlorine gets consumed when it burns up the algae. More algae = faster chlorine usage. I'll drop some links to what you need. You can order it or buy it at the pool store. If money isn't tight, just get the full kit. You'll want it eventually:https://www.amazon.com/Taylor-Swimming-Chlorine-Alkalinity-Hardness/dp/B001DNXK78 Otherwise, they'll have a simpler option that just tests chlorine and ph. You need to be able to track the chlorine yourself unless you wanna drive to the pool shop every single day. Go ahead and get 4-5 of the big jugs of chlorine. Expect to be pouring in 1-2 gallons a day. Once the pool is clear, you'll use way less of it. Use this to determine how much chlorine to add: https://www.troublefreepool.com/calc.htmlEnter the size of your pool, your CYA level (better to be too high than too low if you're estimating it from strips) and the chlorine level you need. It will tell you how much chlorine to add. There's a chart at the bottom with recommended chlorine levels. Until the pool is clear, you want the one that says 'SLAM'.