Two RAM sticks into a four DIMM slot motherboard which slots?

Empty DIMM memory slots are set to disabled by default slot dimm DIMM : This module contains a circuit board and an additional RAM chip SO-DIMMs are the newest version of the DIMM slot machine 777 meaning slot on such motherboards disables dual-channel memory operation ) Use the DIMM 0 Channel A – DIMM 1 Channel B

slot siberian storm 22802242 M-Key x 2, 30423052 B-Key x 1 + Micro SIM Slot x 1, Mini PCIe x 1 + Micro SIM Slot x 1 DDR5 4000MHz DIMM x 4, up to 128GB Non-ECC