Yes I have, and I do step one I download Xenforo and put it on my computer but when I get to step 2 (this part) it says:
"At this point you will need an FTP client and FTP login credentials for your server. If you don't know these, your hosting provider will be able to assist you."
I don't know what my server is. I have a dedicated server for my minecraft server but I don't know how to install/make it or whatever