Desktop (DIMM): Turn off your computer, open the case, locate the memory slots near the CPU, align the module with the slot ensuring the notch matches, and press down firmly until it clicks into place.
Laptop (SODIMM): Power off the laptop, locate the memory access panel on the underside, remove screws, insert the SODIMM module at a 45-degree angle into the slot, then press down until it clicks and reinstall the access panel.