Hello, I wanted to know how I can activate the option to see with the universal block remove the name of the person who put the mine on a public server

1. This isn't a place to ask for help, but to report issues. If you need help, please use the #help channel in our discord server.
2. There's no specific option to do that. However if you are an admin, you can enable the admin tool in the configuration file and (sneak-)rightclick the mine to find out who it belongs to.