perl /usr/share/vhffs/panel/panel.pl

If you get an error message like this one:

Can't locate Vhffs/Misc/Salt.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.8.8
/usr/local/share/perl/5.8.8 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.8 /usr/share/perl/5.8
/usr/local/lib/site_perl .) at /usr/share/vhffs/panel/login.pl line 41.

add an symbolic link between the API Vhffs directory and Perl:

 ln -s /usr/share/vhffs/api/ /usr/share/perl5/Vhffs

cp /usr/share/doc/vhffs/config/apache/panelconf /etc/apache2/sites-available/

then edit the file and adapt it to your needs /etc/apache2/sites-available/panelconf

Once you are ready, run:

a2ensite panelconf
/etc/init.d/apache2 reload