Claiming Bitcoin Cash ABC (BCHA) coins depends on how you are currently holding on to your BCH and what hardware/software you have access to. You can claim your BCHA after splitting.
Choose to “Log with Bitcoin Cash wallet” or “Log with Private Key”, enter the required details to import your unsplit BCH coins from your wallet to MyBCHAwallet.org Bitcoin Cash ABC HardFork, in a transaction, and they will split your coins. The blockchain will quickly synchronize, you will see your correct balance at the time of the network update.