Do you have a question about the iXsystems TrueNAS X Series and is the answer not in the manual?
Configure rails for rack hole types and secure them to the rack using screws.
Install drive trays and air baffles in bays for proper airflow, following a specific order.
Connect power cords to the system's power supplies and then to power outlets.
Release locking levers using the blue clip and pull the controller out.
Slide the controller into the chassis and swing locking levers inward to secure it.