I want to add new information in postbit

[home9000]

I want to add new filed as following :

ALTER TABLE `post` ADD `ips` VARCHAR( 15 ) NOT NULL ;

then I want to save the following info in `ips` :

$ips = getenv ("REMOTE_ADDR");

after that I want to display `ips` in postbit

I am using 3.6.5

any help please to do this change ?