Connect the XLR cable to your microphone. Connect the XLR adapter to the other end of the XLR cable. Most adapters have short lengths, two feet or less, so using a standard XLR cable gives you convenient length.
Plug the 1/8-inch end of the adapter into the pink jack on your computer's sound card. This is the standard jack for accepting microphone audio input into a sound card.
Open your audio mixer and check that audio input from a microphone is enabled. Right-click on the speaker icon at the lower right of your screen and select "Recording Devices." If you added a separate sound card or audio interface, refer to your equipment's documentation for accepting mic input.