[Q] Semaphore Kernerl?

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http://forum.xda-developers.com – I'm a bit confused as to what Semaphore kernel to flash to my captivate running 4.1.2 JB AoCP 4.6. I got stuck at boot screen both times I tried. Flashed the CWM flashable zip file that was provided. Do I flash kernel for SGH -I897JB or GT-I9000 JB? Also, when stuck in boot loop or at boot screen on JB. How do you get to CWM recovery. Couldn't find the 3-button combo. Searched for these answers couldn't find them. (HowTos)