First, please refer to this solution article to remove the power supply shroud for your Neuron computer: https://helpdesk.originpc.com/a/solutions/articles/9000164030-how-to-remove-neuron-psu-hdd-shroud
After you have removed the power supply shroud, you will see a small enclosure which will contain your storage drives.
To remove the enclosure, first remove the two thumb screws that affix the enclosure to the bottom of the Neuron computer case. Please refer to the picture below:
With the thumb screws removed, lift the enclosure at an angle to lift it up and out of the computer case.