How to change your WordPress installation’s site URL in the event you no longer have access to the previous domain name.
NOTE: Before proceeding with any change, it is HIGHLY recommended you save a backup of your database prior to making any changes.
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Log into the cPanel account for the domain in question.
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Click on the “phpMyAdmin” icon within the “Databases” section.
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Expand the database associated with the WordPress installation and select the “wp_options” table.
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Search for “siteurl” within the “option_name” column and click the “Edit” link on the same row.
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Change the domain name within the “option_value” section.
NOTE: Be sure to only change the domain name and not the directory.
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Click the “Go” button when done.
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This should take you back to the wp_options table where the new domain will now be listed.
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Navigate through the pages and search for “home” within the “option_name” column and click the “Edit” link on the same row.
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Repeat steps 5 and 6 to change the URL.
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Once done, you should now be able to access WordPress using the new domain name.