Ok so you know what is the chord, but you don't have any idea how to play it, neither how to place your fingers. You will use all of your fingers, except your thumb finger. You can use your thumb finger to mute string which shouldn't be played. It all depends which chord you will play. If you want to learn more about it, make sure to visit Jamorama the best guitar guide on internet.
Remember, it will not sound perfect when you play it for the first time. That is why you need to practice every day for a little bit. A thousand miles journey starts with a single step! Step by step, and you will become much greater guitarist. You will be a rock fucking star! Trust me. :)
I will now give you diagrams for 3 chords, so that you can practice them.
A major
E 0 / B 2 / G 2 / D 2 / A 0 / E x
D major
E 2 / B 3 / G 2 / D 0 / A x / E x
E major
E 0 / B 0 / G 1 / D 2 / A 2 / E 0
You can see there is a number next to the letter of guitar string. Lets take a look at the A major chord. For example, 0 means that you don't need to put any of your fingers on the first string E. For string B, you need to put your finger on the second fingerboard. Letter x means that you don't play the last E string.
Now, go practice these chords, and come back soon for some new beginner guitar lessons. Till then, feel free to add comment, suggestion or anything like that.
Keep rockin',
Mike