Explanation/Reference:
Note:
To assign or remove administrators to a service application by using Central Administration
1. Verify that the user account that is performing this procedure is a member of the Farm Administrators group.
2. On the Central Administration Home page, in the Application Managementsection, click Manage service applications.
3. On the Manage Service Applications page, select the row that contains the service application to which you want to add or remove administrators. The ribbon becomes available.
4. On the ribbon, click Administrators.
5. To add an administrator:
1. In the first text box on the page, type the user accounts or groups that you want to add. You can click thePeopleicon to validate a name. You can click theAddress bookicon to search for users to add. You can add multiple administrators into the text box.
2. After you have added the administrators, click OK.
6. To remove an administrator:
1. In the second text box on the page, select the administrator whom you want to remove. Note that this step does not remove the user from the system-it merely revokes the user's administrative permissions to the selected service application.
2. Click Remove.
3. After you have finished removing administrators, click OK.
Reference: Assign or remove administrators to a service application (SharePoint 2013)