Help! uninstalling pihole!

Hi, I would like to change my pihole to a different device and have uninstalled it,
I would like to open something else on the pi (Open media vault)
when I directly connect it displays this:
What do I need to do?
how can I completely wipe it from the system?
When I type pihole it is not recognised so I am v confused

Please help! Cheers

How did you uninstall Pi-hole?

Pinhole uninstall


What does the /etc/lighttpd/lighttpd.conf file contain. Do you still have a /var/www/html/admin directory?