× = don't play that string, ○ = open string. Numbers next to a diagram give the fret it starts on.
See every E♭m7 note on the neckE♭m7 is one of the seven chords in: B major (iii7), G♯ minor (v7), F♯ major (vi7), D♯ minor (i7), D♭ major (ii7), B♭ minor (iv7).