This allows you to customize some server wide settings about the WebInterface.  This is where you create login message forms, and custom upload forms that can require users to send additional information with their file uploads.

A custom form can be created by clicking the "New" button.  Then choose your form in the drop down menu.  Click the plus signs on the left side to add new entries to the form, then fill in the information as you are prompted for it.  Once an entry is created you can go back and edit it, or change its order in the list with the buttons on the right.