Changing the look and feel of phplist's pages (the ones that are visible to users, not the list administrator), potentially requires making changes in three places. Each end-user-facing page is constructed as follows:

1. the content of admin/pagetop.php is output. Thus, to change anything before the </head> tag, edit this file directly.
2. that's followed by the pageheader. This can be edited by logging in as the administrator and going to /lists/admin/?page=configure
3. then the actual content of the page is output
4. the PoweredBy variable is added. It's created in admin/connect.php
5. finally the pagefooter is output. It can also be edited as the administrator using the interface at /lists/admin/?page=configure