1. Setup pkg_add

echo "PKG_PATH=http://cdn.netbsd.org/pub/pkgsrc/packages/NetBSD/$(uname -m)/$(uname -r)/All" > /etc/pkg_install.conf

2. Install tor NetBSD's package

pkg_add tor

3. Configure /usr/pkg/etc/tor/torrc

Nickname    myBSDRelay    # Change your relay's nickname to something you like
ContactInfo your@email    # Please write your email address and be aware that it will be published
ORPort      443           # You might want to use/try a different port, should you want to
ExitRelay   0
SocksPort   0
Log notice  syslog

6. Start tor:

Here we set tor to start during boot and call it for the first time:

ln -sf /usr/pkg/share/examples/rc.d/tor /etc/rc.d/tor
echo "tor=YES" >> /etc/rc.conf
/etc/rc.d/tor start