The chord symbol for a suspended chord is the major chord symbol plus the word sus (or sometimes sus4).Suspended chords are often used to add interest to a progression if there is a long section of music containing only one chord.
Dsus
Hold a D major chord shape then place your fourth finger on the third fret of the 1st string.
The open circle on the chord diagram indicates that you hold the major chord shape and add the suspended note with your fourth finger. Suspended chords are usually played just before or just after the major chord, so it is easier to change between them if the major chord shape is held in position.
Rhythm Pattern
Asus
Hold an A major chord shape then place your fourth finger on the third fret of the 2nd string.
Rhythm Pattern
Esus
Hold an E major chord shape then place your fourth finger on the second fret of the 3rd string.
Rhythm Pattern
The following progression is two bars long. Change to the E sus chord (i.e. add your fourth finger) on the "+" after the 3 count.
The next progression contains all three of the above sus chords. Change to the sus chord on the "+" after the 2 count. Use pivot and slide fingers wherever possible between chord changes.
Rhythm Pattern