Edit Page link not showing

I have wordpress installed in several websites, but in this particular one, the “edit” link isn’t showing either in posts or pages.

I’m using the same template page/posts I use in all my sites, and there’s more sites hosted in the same server. Is there a particular reason for this link isn’t showing up?

I’m using this code: <?php edit_post_link(‘Edit’,’|’,’|’); ?> and WordPress 2.6

Thank you!