Tip: memorize the order of the opening strings. Remember that the frets start at the very top of the neck with 1, and go all the way down. You can find resources online.
Place your left hand under the neck of the guitar on the first and second fret.
Your right hand should be relaxed and in front of the sound hole, ready to strum.
Then, place your pointer finger on the 2nd string, 1st fret. Your middle finger should go on the 4th string, 2nd fret. Your ring finger should go on the 5th string, 3rd fret. Press down. This is a C.
Move your right hand up and down, making sure the pick is strumming the strings over the sound hole. Keep a steady rhythm by tapping your foot or counting in your head.
Continue to practice this chord, and when you are comfortable with it, begin to move your left hand fingers while continuing to strum.
Put your pointer finger on the 5th string, 2nd fret. Your middle finger on the 6th string, 3rd fret. Your ring finger on the 1st string, 3rd fret. Press down. Make sure you're continuously strumming.
DO NOT RUSH! It is normal for chord changes to be slow and clumsy at first. If you need to move your fingers one by one that is ok.
Once you begin to get the hang of chord changes, begin to move your fingers all at once if you hadn't been already.
Because you will not be using your pinky finger with these chords, keep it tucked into your palm.
Lastly, the most important step is to keep practicing! Soon, it will be second nature!