Howto LDAP

[tigre21]

Dears friends..
Please ....
this is important for me
I need information of LDAP on QMAIL
I need install LDAP or MYSQL runnig on QMAIL
I am looking: www.nrg4u.com 
but I don't understand 
How works it?
How do install a file .patch?
Please
Response me as soon as possible

Thanks you