After this instructable, you will be able to play a chord on piano!
Step 1: Find Middle C on Your Piano/keyboard.
Look for the the note at the centre of your piano. Press this note.
Step 2: Play the Chord.
While holding down middle C with your thumb on your right hand, play the note one note above middle C with your third finger, and with your fifth, the note three notes away from middle C. It should look something like this.