Pull the line towards yourself, applying tension. Form a bite. having the working end towards the standing part. Fold the line away from the direction of pull, weave the marlin spike through the hole and then pull the line tight.
For a quicker method, place the marlin spike over the line and then form your bite before flipping it once more. An actual knot is not formed, so if the spike is pulled away your line will go back to its original state.