Update 6/1: The Athena wallet app is not capable of splitting your bitcoin held as of August 1st, 2017. We recommend following these instructions to log into the Edge wallet and split your coins. If you didn’t hold bitcoin in any wallet as of August 1st, 2017, you don’t need to do anything.

Download the Edge wallet using the links on their site and simply login using the same username and password you are using for the account that held bitcoin as of August 1st. It should login and show your existing Bitcoin internal wallets. Pick the wallet that held bitcoin as of August 1st and tap the three dot menu to the far right. Select Split from the menu and confirm that you want to split that wallet. You should be given a new BCH wallet with the same name as the BTC wallet you selected. The app will automatically find and display your Bitcoin Cash balance. Repeat steps 2-4 for any other Bitcoin internal wallets which may have held BTC as of August 1st.

For Bitcoin Gold and all other post BCH forks you will still have to use the manual instructions below. You will need to substitute a Bitcoin Gold or other compatible wallet (Coinomi will work in many cases).