The Use Member Sections checkbox allows you to enable/disable the Member Sections feature. If this checkbox is checked (the default option) the template will place generated members in dedicated target sections for those members.
You can customize adding a comment in the start of a member section or wrapping a section into a region using the Comment or Region button.
Use the "Comment text" or "Region name" field to specify the text for the target comment or region.
See Member Sections for details.