You can change the order the links appear by using the arrows to arrange them. Click the edit pencil to change the name or link.

To create a new icon click any of the green plus signs. This will bring you to the page below in which you need to enter the NAME and LINK.

Resources:

Link List Help Article

Other than NAME and LINK, no other fields need to be entered on this page. If you wish the page to be opened in a new window/tab then click the box "Open link in new window". Once everything is saved it will show up on the bottom of your website as shown below.