ได้แล้วครับ ใช้เวลาหา 5 ชั่วโมง
Here’s how. This is assuming your hosting account is setup with phpMyAdmin. (If you don’t have database editing experience, you might want to make a database backup just in case.)
1 Go to your hosting account’s cPanel and click on the “phpMyAdmin” icon. If you don’t see it, look for a “MySQL Databases” icon, click it, scroll down to the bottom of the page, and then click the phpMyAdmin link.
2Select your WordPress database from the menu on the left.
3 Select the wp_users table, and then click the “Browse” tab.
4 Locate the row that has your username in the user_login column. Click the Edit button (the pencil icon) on that row.
5 Enter the desired URL version of your name into the user_nicename field.
6 Click “Go” to save your changes.
And that’s it! Your author archive will now show up at your new URL.
จากเว็บนี้
http://wphacks.com/change-author-archive-permalink/ 
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