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Add host key
Right after you click the Open button, you'll probably see a scary-looking dialog like this one. But have no fear, as it's actually harmless. If you click Yes to add the server's host key to PuTTY's cache, you won't see this message again for this particular job flow.
You're almost there! When you see the "login as:" prompt in PuTTY's terminal window, enter "hadoop" (without the quotes) and tap Enter. That should log you in.
Welcome to your cluster
Upon successful login, you should see a welcome screen and be presented with a command prompt. The message telling you how to gain access to the Hadoop "UI" should be taken with a grain of salt, however, as that user interface is presented in Lynx, a text-based Web browser.