First you'll need your guitar!:)
Hold the guitar near the first fret(the strings near the top of the guitar)
Your going to place your pointer finger on the second fret(second box down from the top of the guitar) and place it on 2nd string(the 2nd thickest string)
Now add your middle finger to the second fret on the string right below your pointer finger.
Your finger position should look like this.
Video explaining finger positions.
Then you want to take your pick and strum all strings of the guitar.
And there you go! Your playing an E minor on guitar!😄