Depress the button on R1, and move it out. Then, depress the lock button for R2 and flip it over to engage the auto rewind. When it's done rewinding, flip R2 back into the rest position, and open the back. R1 will pop back into place as soon as you advance the camera with the back closed.
Nice on the 'tax.
F4s, F2AS, F FTn, FM2n, Nikomat FT2 - John Laughlin Photography - nature photographer