To Manage SharePoint 2010 Farm Administrators, follow the steps given below.
Go to “Central Administration”, select “Security” and go to “Manage the Farm Administrators Group”. Within this screen we can manage the Farm Administrators.
To remove a user, select the user by clicking on the checkbox on the leftmost column, go to “Actions” and click on “Remove Users from Group”.
(The reason why I wrote this simple blog post is, in one of the popular SharePoint 2010 Administration books I read recently, they have guided the reader in a wrong path)