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To use the Azure Automation preview feature, you must enable the Automation feature in the Azure portal. To do that, you need an Azure subscription. The easiest way to get one is to sign up for a free trial subscription at free one-month trial. With that subscription you get up to $200 in credits for Azure services that you can use during the trial period. All you need to get a trial subscription is a Microsoft account, a phone number, and a credit card. After that trial subscription, if you decide you want to keep using Azure, you can upgrade and start paying for the services.
To enable Azure Automation, do the following:

1. Go to the Azure Management Portal at manage.windowsazure.com, and enter your credentials to log in to your subscription.

2. Click Subscriptions to see a list of your subscriptions.

3. Click Manage Your Account, and then click Preview Features to see all the available Azure features. Click Try It Now for Azure Automation.

4. Select the Azure subscription for which you want to enable Azure Automation. After you complete the registration process, you will see the Azure Automation icon displayed in the left side of the portal.

5. Click Learn More in the Azure Automation section to find information to help you get started. You can find the latest documentation on Azure Automation, run a simple tutorial, jump to the Runbook Authoring Guide, and access the Azure forums to discuss and get answers from others about Azure Automation.

The Learn More page includes a link to the Automation Library. From there, you can access step-by-step directions about how to perform various Azure Automation tasks. For instance, you can learn how to create, schedule, and execute a runbook. The Learn More page provides useful sample runbooks from Microsoft that show how to simplify common tasks and demonstrate useful concepts. In addition, you will find information about how to back up Azure Automation objects before deleting an Azure Automation).

Source of Information : Azure Automation