Change the Subscriptions views....

Hi,

I am new to use simplenews module...i found it is good for newsletter....I want to change the view of the Subscriptions views....that mean if you go to http://localhost/drupalselva/?=admin/content/simplenews/users...than we can see

Emailsort icon Username Status Operations ....in that i want to replace Operations as Subscriptions Status...with Update options(Subscribe and unsubscribe)..like active and deactivate....i want some help...

Thanks and Regards,
Muthu.S