You have to take the 2 corners caps off, 2 Philips screws each side. The snap is on the back.
Opening the top half way, and looking straight down. on the back side of the rear window seal you will see the cable.
You will need a 10mm articulating ratchet, and a pair of needle nose, or 7-6mm open end wrench.
If you safety your top. you can remove the strut pivot for easier access.
NOW BE WARNED
If you have a old top, then removing the cable and top from the cable tray you have to be really really careful, as the older tops are brittle, and can break, rip, shred, tear, and generally destroy itself. GINGERLY is the operative word, Don't yank or Pull hard, coax it out carefully.
After you have it out, then you can Push it to the inside of the car body. Use plenty of Lube on the inner tray and top when going back, and don't over tighten the cable, as Snap crackle and pop comes to mind.