FBA using LDAP authentication in SP 2013

I am trying to setup FBA in Sharepoint 2013 using LDAP authentication method. i followed all the steps in 

http://technet.microsoft.com/en-us/library/ee806890.aspx . But everytime i edit central admin it throws an error. I read somewhere that editing web.config file for CA is optional. Is it true in SP 2013 too? 

Also only changing web.config file would do. Do i have to set up something in database like done in this blog

http://blogs.visigo.com/chriscoulson/configuring-forms-based-authentication-in-sharepoint-2013-part-1-creating-the-membership-database/

Also is there anything that has to be done from LDAP provider too?

sachin