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If you are not using Multisite, access your database via phpMyAdmin (most hosting providers offer this in your hosting account’s control panel), go to the wp_users table and find the row for your user_login. Note the ID of this row. Now, go to the wp_usermeta table and find the wp_capabilities row for your user_id. Set the value of this row to:
a:1:{s:13:"administrator";b:1;}
Thank you for your anwser. I will do it now.