The Old God has left the world and the pretenders are awakening and coming out from hiding. You start the game by designing one of the pretender gods that will compete for true ascension to godhood. The type of god can range from a magically powerful arch mage to an ancient kraken or a mystic monolith that people pray to.
Open the Steam client, login and locate the Games tab on the top menu. Click this and then select “Activate a Product on Steam…”
Enter your unique code that's displayed on the 'Orders' page of CDKeys.com and follow the prompts to activate.
Your game is now viewable in the “Library” tab and is available to download/install when you’re ready. You can find additional support for the Steam client here: https://help.steampowered.com/en/wizard/HelpWithSteam