Check your fermentation with a hydrometer. It should have started about 1.040 - 1.050 and ferment in one to two weeks to dry. .998 or thereabouts. It will start to clear as it hits 1.000 or lower. Keep it under airlock because it is lower alcohol; more like beer than wine.
As soon as it is dry, in a large sauce pan, add between 4 to 8 cups cane sugar (I use 4 but you should add 4 to the whole batch then taste; add more if necessary for your taste), 2 cans lemonade concentrate, and 3 cups water and, stirring continuously, bring to a simmer. Remove from heat, and dissolve 3.5 teaspoons of potassium sorbate. Add lemonade/sugar/sorbate solution to a 7 gal bottling bucket. Rack the fermented lemonade from your carboy into bottling bucket with the sorbate solution, stirring thoroughly.
You can bottle in beer or wine bottles, or you can keg. Even with the sorbate, you will probably get a little bit of carbonation as it sits, but it is usually not enough to pop a cork. I usually keg, and force carbonate.
It is ready to drink on bottling day.
Here is the original recipe:
Full Hard Lemonade recipe