"Permissions for this list" link is missing on the Settings page
I created a list and expected everyone who has access to the site to be able to access the list but some cannot. According to MS on-line help, I should be able to edit permissions for the list. But when I get to the Settings page, the "Permissions for this list" link is not there. Did I do something to turn this option off? Another list that I created the same day on the same site has the link.