Take your wrap strand and make a v-shape over your other strands.

take the long end, wrap it around all of your strands, trapping the v.

Keep wrapping the long tail about 5 times around.

Take the long strand and pass it through the v.

To complete the knot, pull on the shorter strand which will trap the longer strand underneath the knot.

and there you go! A nice, clean, wrap knot to start your macrame projects.