Return it . . . and get *dichlor*

Bleach is for later; right now, you need chlorine, stabilizer and a good pH level. Dichlor will add chlorine, stabilizer, and lower the pH. Buy borax at the grocery store to raise the pH back up. Later, when you have enough stabilizer, you'll want to switch to bleach. But, by using dichlor and borax NOW, you have very little to manage, and can get by with a cheap OTO / phenol red drops kit.

Also, complete the Pool Chart; it will allow us to tag your posts with detailed info on your pool, so we can respond better.

Ben

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+ If you need stabilizer, and have access to a Sams Club, buy their 24 pack of 1# bags of dichlor shock. Each bag will add about 7 ppm of chlorine, and about 6 ppm of stabilizer, per 10K gallons of water. Otherwise, order dichlor from Amazon:
Kem-Tek Dichlor 22 lbs
We do NOT recommend buying dichlor locally, otherwise, at least until you are an EXPERT reader of chemical labels. The chlorinating pool chemicals sold at Walmart, Kmart, Costco, and most other local stores are diluted blends, sometimes with copper and other products with bad side-effects.

+ It's much easier to answer your questions, when we have the details about your pool in one place. We often 'waste' the first few posts back and forth collecting information. So, please complete our new Pool Chart form -- it takes about 30 seconds, but will save much more than that.
Pool Chart Entry Form