How to manually modify order status in magento background

How to manually modify the order status on the Order details page:

Open this file: app \ design \ adminhtml \ Default \ template \ sales \ order \ view \ history. phtml

The 34 rows are as follows:

<? PHP foreach ($ this-> getstatuses () as $ _ code =>$ _ label):?>

To:

<? PHP foreach (Mage: getsingleton ('sales/order_config ')-> getstatuses () as $ _ code =>$ _ label):?>

 

Refresh the page to see if :)

 

How to manually modify order status in magento background