I am a little concerned about this. How do you know you need more refrigerant? Adding too much refrigerant is just as bad as not having any. I don't recommend working with refrigerant unless you have the proper gauges. However, what you are looking for is two little valves. They will have a cap that looks exactly like a tires inflation valve. You will have a compressor which is on your engine and is ran by a belt. It will have two lines on it and the valves will be located at some point along those lines.
You add it where it i circled it. Be sure to check the pressure with a guage first to make sure more is really needed. 
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I could point it out to you but hard to do over the computer. I can try to find a pic.
I found a picture and circled where it goes but it wont let me add the pic
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