I successfully installed and configured your plug-in. Very simple.
But, I need to remove one of the Fixed Fields - the "Your Website" field, specifically. I checked the box next to it in the Fields tab under the Manage Fixed Fields heading, but the Bulk Actions dropdown only contains a choice for Save, not Delete, as in the Manage User Fields area.
I could hide this field with CSS easily enough, but can't figure out why I can't delete it in the plug-in configuration. Many visitors to the site on which I am working don't have websites, and although I can set the field to Not Required, I just want to remove it.
TIA for your help!