add_action for adding/editing links page

Hi,

I am developing a plugin and I want to add a little form in the add/edit links (blogroll) page.

I am using add_action with the add_link and edit_link parameter but this does not work at all.

function newformoptions_meta_link() {
	add_meta_box('newformoptionsdiv', __('Options'), 'newformoptionsdiv_meta_box', 'link', 'normal', 'high');
}
add_action ('edit_link', 'newformoptions_show_value');

How could I do this? Thank you.