Power off the desktop
Unplug the power cable
Press the power button for a few seconds to discharge residual power
Open the computer case
Ground yourself to avoid static electricity
Locate an available 2.5-inch drive bay or mounting point
If needed, use a 2.5-inch to 3.5-inch adapter bracket
Mount the SSD securely in the bay or bracket
Connect a SATA data cable from the SSD to a motherboard SATA port
Connect a SATA power cable from the power supply to the SSD
Close the computer case
Plug the power cable back in
Turn on the desktop
Enter BIOS or UEFI if needed and confirm the SSD is detected
Install or clone the operating system if the SSD is new
Set the SSD as the boot drive if it will hold the operating system