when you unzip the pentaho bi sever file after installing it you will find tomcat folder under bi-server folder, if you are not able to find it then their is problem in downloading file, so download it again..
for changing default port number, you can change it
\biserver-ce\tomcat\webapps\pentaho\WEB-INF
under this you will find web.xml file
<context-param>
<param-name>base-url</param-name>
<param-value>http://192.168.60.195:8080/pentaho/</param-value>
</context-param>
here instead of 8080 change the port number which suits you.