A custom HTML intro allows you to present a page where visitor have to click a button to enter your site. Many other things can be done with this kind of page like presenting different language options or options to enter a fine art or commercial site.
Under DESIGNS and DESKTOP LAYOUT click the INTRO tab.
You can upload an HTML page using the following file as your guide or simply modify this file to make it your own:
IMPORTANT: Make sure you use a text editor to edit and save this file.