HOW to remove widgets from index page

By HCI
http://community.elgg.org/pg/search/?q=index+page&search_type=comments&friends=0

Hi All

1.  How do I remove widgets (for latest groups, friends, etc) on index/home page if am the default installation. I want to only have login and then put my own images and ads only.

2.   How do I remove widgets (for latest groups, friends, etc) on index/home page if am a plugin installation. I want to only have login and then put my own images and ads only.

Thanks