Google is not showing v.good sitelinks of my site and i want to change and add some more in to it can any 1 tell me how to do that and how google pick these links
You can only remove ones you do not want listed but YOu can not add new ones. They are picked by googles algo
You can only remove the ones you do not want them to be shown but you cannot adjust it directly by yourself. If you read carefully you should already noticed that sitelinks will be picked up automatically by Google. It's depend on your current site navigation and how relative between homepage and inner pages.