you'l be playing the top 3 strings mostly (E,A,D)- your first finger plays the "c" (6th string, 8th fret) while basically muting all others- second finger plays "g" (5th string, 10th fret) and your fourth finger will hammer on the "d" (4th string, 12th fret) then slide up to the d# (4th string, 13th fret)- strum out the chord in time to get the feel for the hammer and slide-