How to put in CD key?

I have a Diablo III Game bought a long time ago. I have not played for a few years, now I installed the game, but it never asked me to enter the game key. After finished the skeleton king, it asks me to upgrade, but no place to enter the key. Please help.
Thanks

Your key can only be claimed one time on your Battlenet account. If you claimed the key already then you need to log into the Bnet account that you used it on. Bnet accounts are formatted as email/password.

If you have not used the key before you can claim it on your current Bnet account which unlocks content past the Skeleton King.

To claim a key open the Launcher.

  • Top right click your name
  • from the drop down list click Redeem a Code

You can also do it from the Website by clicking your Bnet Name in the top right of the screen and selecting Account Settings from the drop down list.

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