Procedure to change site collection administrator
In a SharePoint site, site collection administrators have full rights to all sites within a site collection.
Use the following procedure to change the primary and secondary site collection administrators.
Step 1: Go to Central Administration using a Farm Administrator account as shown below.
Step 2: In Central Administration, click "System Settings" from the left navigation. Then you will be navigated to the System Settings page.
On the System Settings page, in the "Site Collection" section select the "Change site collection administrator" option as shown below.Step 4:
When you click on the site collection you will be navigated to the Site Collection Administrators page as shown below.
By default you have one site collection, you can change a site collection from the dropdown as well.Step 6:
In the text boxes you can change a primary and secondary site collection administrator and click "Ok" to save the changes.
Finally the site collection administrator will be updated successfully.Summary
In this article we explored how to change the primary and secondary site collection administrators in SharePoint 2013 using Central Administration.