You have no CYA and very low FC. That's why algae has started growing.
FC = free chlorine. CYA is stabilizer, think of it as sunscreen for the chlorine.
Basically, your salt water generator can't keep up. You will need to kill the algae that's in there and get some stabilizer in the water. To do this right, and as fast as possible, you will need your own test kit. You can read the article in
Pool School or skip right to the end and go to
http://tftestkits.net and order a TF100. I recommend the XL option as you will be shocking. I also like the speedstir. And with a SWG, some salt test strips would also be wise.
Next, head over to
Pool School and start reading.
Tomorrow, when the stores are open, you will need to buy some stabilizer and a bunch of bleach or "liquid chlorine" or "liquid shock." It's all explained in
Pool School.
You need to get that stuff in ASAP, and unfortunately, without your own test kit, you will be handicapped a great deal. You'll need to make your best guess as to how much bleach to add just to keep the algae at bay until you can do the shock process accurately with the test kit you ordered tonight. And no, the kits at the pool store are not sufficient unless they have the FAS-DPD test, and most don't, unless it says so on the box. Ignore what the salesman says, it is not the same.