I will highlight only the changes from there - when it comes to a secured LDAP connection.
1. Change the ConnectionURL and set ldaps instead of ldap and set the port correctly.
2. Import the LDAP server's SSL certificate in DER format to [CARBON_HOME]\resources\security\client-truststore.jks. If the certificate is not in DER format you can use OpenSSL to convert it to DER.
3. When starting the Carbon Server - start as following.
$ sh wso2server.sh -Djavax.net.ssl.trustStore=/[CARBON_HOME]/resources/security/client-truststore.jks -Djavax.net.ssl.trustStorePassword=wso2carbon
There replace [CARBON_HOME] with your absolute path to CARBON_HOME.