You can submit a link in two ways:
Choosing to "Submit Link" from the Links top menu or "Add Link" from the left menu is the first choice that is made when entering a new Link on the Links section. Other way is first selecting a category then a subcategory (or directly a subcategory) where the Link wanted to be located and click on the "Add URL" link towards the bottom.
Selecting in either way it will open a submit form for you to fill out. Fill in the provided form. The first selection that can be made on the page is to select a proper category for your link that will be submitted. Although you will see the category name here if you firstly selected the subcategory then submit. If you did not see a category that fit your link's description, contact with the admins of the site and they'll be happy to add it for you :)
Then you have to complete the "Website Title", "Link URL", "Email", and "Description" fields those required. You can go on with the other fields (keywords, banner url, etc) as well but they are not the required ones.
Once you have filled out all of the items for your link, click on the "Submit" button to submit your link to the site administrators. You can use "Reset" button to clear the form. If the site is configured to require approval for new links then you will receive a message that your link submission will be reviewed by the administrator and if approved will then appear on the Links section. Until the link is approved it will not show up on the Links. If the link is not approved by the administrator the link will be deleted and not show up on the Links, although you will receive an email to let you know whether or not your link has been approved. If the site is configured to accept the requests online then a summary page about your link will be shown and added to the Links database immediately.