Click on System -> Install -> Extension on your Joomla site.
Search for miniOrange LDAP under Install from the web and select the LDAP Integration with Active Directory and OpenLDAP – NTLM & Kerberos Login plugin.
After selecting the plugin, click on the Install plugin.
Now click on install again.
After the installation is successful, to navigate to the miniOrange LDAP plugin, click on the ‘Start Using miniOrange LDAP plugin’ button as shown below.