The Support documents are readily available.
When you come to this forum you should see "Support" as a menu choice on top, just below your admin bar. Here is the link, and remember the support section has a search bar; and it can be bookmarked in your browser:
http://support.wordpress.com/
If you are on your dashboard:
http://drsumantasaha.wordpress.com/wp-admin/index.php
then there is a link to "help" on the top right of your screen. There is a menu to "get help."