Pretty easy to set it up. If your in CAS:
You can use whatever FTP client you want. I personally use
FileZilla which is really easy to use.
To log on you need to use MacID and pass is your student #. Not your regular password you use to log into mugsi but you can change it to be that aswell if you want. The folder you need to upload files to is "public_html" in your macid directory. Your homepage is named index.html.
If you get stuck check this out:
http://www.cas.mcmaster.ca/support/faq/index.html;
(Personal Webpage FAQ) Wouldn't believe the time I spent searching for this haha. You can PM and I'll try my best to help too!
If you not in CAS contact your dept. I guess and ask. I'm sure the process would be similar though?