Those of you who want to have a homepage at http://www.mcs.anl.gov/~username, you must have an MCS workstation account and the public_html resource. You can request both of these resources at https://accounts.mcs.anl.gov/.
The resource creation takes care of getting you a directory on the server and linking it into your home directory at ~/public_html. From there, you can add and edit files to your liking. If you already have a public_html directory, it will be copied to the server first.
You can also use this method to enable public_html for any secondary accounts you may have, just select the right account to add the resource to.