Visit Klout’s homepage and click Sign Up.
You can sign up using Facebook, Twitter, or an email address.
Note: We’re looking into supporting other social networks as the base of the Klout account in the future.
After you authorize Klout to access and to read your social network data, you can add other accounts, including Twitter, Google +, and more to Klout. After you complete your Klout registration, we will generate your Klout Score in about 48 hours.