creating user with scponly utility

I just installed shells/scponly, but I cannot figure out how to create a chroot user..
Could anyone please show me the syntax?
I tried adduser -d /usr/local/www/httpdocs /usr/local/bin/scponlyc testuser but I ended up with the same screen as creating a new user
Sorry still not getting it to work..
So when I use adduser(8), I only have Shell (sh csh tcsh scponly nologin)..
My understanding is that scponly is non chroot and scponlyc is for chrooted. but scponlyc isn't there..
What am I missing