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[misty]

I searched for this file to edit, but there is no such file, also no Lize folder exist under /includes/languages/english/html_includes?
My Define Main Page Status is set to "1" in Admin-->Configuration-->Define Page Status

The name of your current template is Lize which is stored in
/includes/templates/Lize/

To alter define_main_page for this template(Lize),
you need to

1.create a folder, named Lize, in
/includes/languages/english/html_includes/
2.Then you copy and send via ftp, define_main_page.php
from
/includes/languages/english/html_includes/
to
/includes/languages/english/html_includes/Lize/
3. Then you can edit via your zencart admin