Hi, and welcome to pool ownership!!
You need to add chlorine to the water...many of us use bleach, but you can use trichlor tabs in a floater, or cal-hypo or dichlor powder if you'd rather. You need to get a test kit so you can test your water--if your local WalMart sells the hth 6-way kit, that would work fine. If not, at least get the cheapie OTO (red and yellow drops for pH and chlorine). As long as your chlorine is between 1-3 ppm, and your pH is between 7-7.8, and the water is clear, you're fine to swim.
Until you have some stabilizer in the water, the sun will consume your chlorine pretty quickly, so you'll have to add some 2-3 times a day to maintain the 1-3 ppm of chlorine to keep the algae out. You can add stabilizer (you can get it at WalMart in the spa section--labeled balancer or conditioner, but cyanuric or isocyanuric acid is the main ingredient) through an old sock hung in front of your return. Give it a few days to dissolve, then test for CYA. At that point the pool should start holding chlorine better.
Run a set of tests with the kit (except CYA--there won't be any in there until you add it) and post them here, and we can help you go from there.
In your pool, I'm estimating about 7600 gallons. In that much water, each 2 cups of 6% bleach you add will raise your chlorine by 1 ppm, so you can use that as a guide to figure out how much to add each time to maintain 1-3 ppm.
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