Ok, notes on slash chords. The slash chord A/E simply means
play an A chord like you usually do, but make the bass note an E.
So, in this example, you'd add the 6th string (low E) to the A chord.
For other examples refer to the Slash Chords section on the
Online Guitar Chords site. This little explanation will hopefully help you
figure out slash chords that may not be listed on that site.