HPE ProLiant ML30 Gen10 Plus Maintenance And Service Manual page 82

12. If you are not immediately installing the new processor, install the processor socket cover:
a. Close the processor load plate (callout 1), and then engage the hinge lever (callout 2).
b. Insert the alignment tabs of the socket cover to the back of the processor load plate (callout 1).
c. Press the cover down until it clicks into place (callout 2).
HPE ProLiant ML30 Gen10 Plus Server Maintenance and Service Guide 82