Starting Knot

Step 1:

Cross the left (blue) end over the right (yellow) end. The left (blue) end is now on the right side.

Step 2:

Begin to wrap the right (blue) end around the front of the left (yellow) lace to end up at the back of the gap between the laces.

Step 3:

Feed the right (blue) end through the gap to emerge at the front right-hand side.

Step 4:

Pull both ends tight to complete the knot.