I am following these steps from https://technet.microsoft.com/en-us/library/dn635311.aspx
Configure SharePoint for the new identity provider
Use the following steps to configure your SharePoint installation to the new identity provider for Azure AD.
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Verify that the user account that is performing this procedure is a member of the Farm Administrators SharePoint group.
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In Central Administration, on the home page, click Application Management.
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On the Application Management page, in the Web Applications section, click Manage web applications.
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Click the appropriate web application.
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From the ribbon, click Authentication Providers.
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Under Zone, click the name of the zone. For example, Default.
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On the Edit Authentication page, in the Claims Authentication Types section, select Trusted Identity provider, and then click the name of your provider, which for purposes of this article is ACS Provider. Click OK.
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The following figure illustrates the Trusted Provider setting.
I get stuck at step 7 Trusted Identity provider option is greyed out and I cannot select.
Why?