Using /stand/sysinstall for 5-STABLE package installation

[FreeBSD User]

Hello,

When I installed my system, I used the .iso images of 
5.4-STABLE-SNAP006 for a minimal installation and then installed 
various packages using pkg_add -r, downloading them from its default 
setting of ftp.freebsd/pub/FreeBSD/ports/i386/packages-5-stable/Latest.

I would like to use /stand/sysinstall for installing additional 
packages but its option release name is set to use 5.4-STABLE-SNAP006. 
This gives an error message saying that it cannot find that 
distribution on an ftp server. I've tried changing the release name 
under installation options but nothing I've entered works (e.g., 
"5.4-STABLE" or "5.4-LATEST"or "RELENG-5").

So how do I configure /stand/sysinstall to point to the latest stable 
version to use it for installing additional packages?

Confused FreeBSD User