How to set quota in sqwebmail

Hi 

        I am new to qmail/sqwebmail.. Installed first the 
courier-imap-3.0.6, then installed sqwebmail-4.0.7. It is working but few 
things are not correct somewhere i am missing.. 

       -  The images for qmailadmin/sqwebmail are missing
       -  I want there should be *Quota* option in the *qmailadmin*
          screen but it is also not coming 

So
       - how i will correct the image path ?
       - and what needs to be installed , so that i  get the
         *Quota* option.. 

Thanks in advance..