How do I get FileZilla from other people?

I run a Minecraft server through Nitrado to play with friends and acquaintances. I gave one of them the console and he only did bad things with it. I took the console back from him but he still has FileZilla and I don't know how to take it away from him. With FileZilla he always deletes the corrugations and other important things.

Can someone help me?

Haha

Simply change the FTP password.

Is it that easy?

Yes, go to the Nitrado panel and switch there, then it won't come in anymore.

Oh ok thank you