Same way you get to Carnegie Hall…
By Subway
A, C, B, D, or 1 to 59th Street / Columbus Circle (elevator available)
N, Q, R to 57th Street / Seventh Avenue (elevator available)
B, D, E to Seventh Avenue
F to 57th Street / Sixth Avenue
By Bus
M5, M7, M10, M20, M31, M57, and M104 stop nearby.