How to add freon to 2007 Mitsubishi Galant?

About a year ago I purchased a 2007 Mitsubishi Galant from my bank as a repo and now the A/C has stopped blowing cold air. I know it needs a freon recharge but I can't find the valve to attach the hose and freon to. I bought the car without an owner manual and can't find it anywhere. If someone cold help me I would greatly appreciate it. This 100 degree Texas weather is killing me LOL!