Connecting Zwift and Garmin

Please could somebody help a total novice?
we have garmin speed sensor and cadence sensor
We have a hp computer with zwift downloaded
how do we connect the two sp we can race?

You need to know if your computer has Bluetooth or ant+ and you need to know if your sensors have the same.

You should be able to pair them in zwift at the pairing screen by pedaling so the sensors are awake (you may have to hold a button on them so they are discoverable) and when you hit search they should pop up in the list.