First you must set your authnet module into "Authorize Only" mode.
Then, after a tiny edit to the payment module's PHP file, you'll be able to do captures directly from your admin order-page ... on the same screen where you update the order status. They're separate steps, but done on the same page.
The edit: Open your /includes/modules/payment/authorizenet_aim.php file. Find "function RENAME_admin_notification(" and remove the RENAME_ part; then save the file back to your server.
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