You'll need a pair of sneakers with soft laces. A pair because you'd look awfully silly in only one shoe, but don't let us get in the way of your sartorial splendor. Soft laces because, depending on your manual dexterity, you may need to practice.
Tighten the criss-crossed parts of the laces to your desired level of tightness. Taking the trailing lace from the right-hand side, fold back on itself to form a loop. Holding the trailing lace from the left-hand side, wrap the loop once in a counter-clockwise direction, making sure that there is a little slack. Insert a loop from that left-hand lace into the slack of the wrapping. Carefully pull the loops in opposite directions, being careful not to pull the tips of the laces (sometimes called floogle-binders) through. Adjust to your aesthetic specifications.