Make sure you are already logged in. Navigate to the section that the link was added to. Click the "Links" link in the Tool Bar. Find the category that the link was added to and click that category's name. In the list of links that have been added to that category, click the "Update" link for the link that you would like to update. Figure 1 shows the listing of categories within the section and the links that have been added to a specific category.

Category and Link Listing
Figure 1: Category and Link Listing

For information about the fields, see the Adding a Link help file.