installing amanda from ports

[Michelle]

I'm trying to install amanda from the ports collection.  Before running 
make, the amanda instructions state to run ./configure 
--with-user=amanda --with-group=backup to change the default 
configuration.  How do you do this with FreeBSD?  I've tried running 
./configure from the /usr/ports/misc/amanda-server directory which does 
not work.  Do I need to be in a different directory or is there another 
way to change the options before running make?

Thank you,
Michelle