Have you checked out the documentation? This may help: https://docs.netdata.cloud/collectors/python.d.plugin/mysql/
(Edit for additional context)
All plugins (aka collectors) are installed by default—you don't need to install the MySQL collector.
To enable the collector, navigate to the /etc/netdata directory
and use the edit-config
script.
cd /etc/netdata
sudo ./edit-config python.d/mysql.conf
Configure the collector job according to your setup, and then restart Netdata and refresh your browser once it's running again.
Other resources about editing config files:
configuration guide
basics of configuring Netdata
Hope this helps!