help: using web.xml to map hello.war

[javac javac]

from <http://www.eatj.com/> faq:
Q: Why my servlet does not work?
A: Your servlet only works in http://yoursubdomain/servlet/*. You need use web.xml to map it. 

1.) where's web.xml?
2a.) do i: download, edit, upload web.xml?
2b.) can i edit web.xml with either Tomcat Administration or Tomcat Manager?
2c.) can i edit web.xml via telnet/ssh?

any help'd be much appreciated,

javac at mail.com
http://javac.eatj.com/
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