Open this file in your favorite XML editor:
jakarta-tomcat-5.0.19/conf/tomcat-users.xml
Add these two elements after the last 'role' element:
<role rolename="manager"/> <role rolename="admin"/>
Add this element after the last 'user' element:
<user username="admin" password="admin" roles="admin,manager"/>
If you have tomcat running, you'll have to restart it.