enabling FTP on ALfresco 4, Some confusion

[bisana]

Hi All
I am trying to enable FTP serive on Alfresco, I am using  4.2.a on CentOS 6.3
I have been refering the docs at
http://docs.alfresco.com/4.0/index.jsp?topic=%2Fcom.alfresco.enterprise.doc%2Fconcepts%2Ffileserv-ft...
After going through the docs, I was not able to find which file this entry should me.
based on my 'CIFS on Alfresco' experience, I assume that the file to be edited is

tomcat/shared/classes/alfresco-global.properties‍

But in some places in the wiki it is given in another way http://wiki.alfresco.com/wiki/File_Server_Configuration#FTP_Server_Configuration 
They are mentioning to edit file-servers.xml file in the WEB-INF\classes\alfresco folder, or the file-servers-custom.xml file in the \tomcat\shared\classes\alfresco\extension folder
I did search for 'file-servers.xml' and 'file-servers-custom.xml' , I was not able to find them

Just not sure which path to select. Do I need to relay only 'alfresco-global.properties'
Guidance and help requested

[bisana]

Now I am able to get the FTP logi, access
This is what I had done in alfresco-global.properties

### FTP #####
### FTP Server Configuration ###
ftp.enabled=true
ftp.port=21
# An empty value indicates bind to all available network adapters
ftp.bindto=

# FTP data port range, a value of 0:0 disables the data port range and will use the next available port
# Valid range is 1024-65535
ftp.dataPortFrom=0
ftp.dataPortTo=0

# FTPS support (enabled when the keystore, truststore and passphrase are set)
ftp.keyStore=
ftp.trustStore=
ftp.passphrase=
ftp.requireSecureSession=true
ftp.sslEngineDebug=false
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Now after I log in as user, and giving 'pwd' I get '/' as working directory, what should I do to get the sites
Thanks