This is a half note (or minim) worth two counts. Two half notes make up a complete bar in * time and are played on the first and third beats.
In the following example there are two chords per bar.
Here is a timing variation of the previous example using half notes and quarter notes.
The open 3rd string is an A note.
Play this B note with the second finger of your left hand just behind the second fret of the 3rd string.
Play this C note with the third finger of your left hand just behind the third fret of the 3rd string.
The open 4th string is an E note.
Play this F note with the first finger of your left hand just behind the first fret of the 4th string.
Play this G note with the third finger of your left hand just behind the third fret of the 4th string.