How to set username and password for Tomcat 9.0.2 in macOs.

i tried with role admin and manager-gui

  <role rolename="tomcat"/>
  <role rolename="role1"/>
  <role rolename="manager-gui"/>
  <role rolename="admin"/>
  <user username="tomcat" password="<must-be-changed>" roles="tomcat"/>
  <user username="both" password="<must-be-changed>" roles="tomcat,role1"/>
  <user username="rakesh" password="123" roles="manager-gui,admin"/>