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format and install
You can go in and deinstall all the packages and ports by following these instructions:
To deinstall Plesk, follow these steps:
1 Log in as root.
2 Run the command /usr/local/etc/rc.d/psa.sh stop
3 Run the command pkg_delete `pkg_info | grep psa | awk
'{print $1}' | xargs -n100`
4 Run the command rm -rf /usr/local/psa
5 Delete all references to DNS zones from the file
/var/named/etc/namedb/named.conf, remove zone files from
/var/named/etc/namedb/master/, and modify the file
/etc/rc.conf appropriately.
6 Run the command rm -rf /etc/psa