You can find the LDAP settings for SkyVault Process Services in the activiti-ldap.properties file located here:
webapps/activiti-app/WEB-INF/classes/META-INF/activiti-app/activiti-ldap.properties
The default configuration works with the sample LDAP settings provided with the installation bundle, however you can easily override them by creating a new file called <InstallLocation>/lib/activiti-ldap.properties, and override the properties that requires changing.
For further details about configuring LDAP for SkyVault Process Services, see External Identity Management (LDAP/Active Directory).