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It's easiest if you hold the two leftmost strands in your left hand, and the two rightmost strands in your right hand, allowing the center strand to hang loose. Numbering the strands can help you keep them straight. They should look like 1 2 3 4 5. Move it over strand 2, and under strand 3, so that it's now in the center. You should now have 2 3 1 4 5. You are essentially weaving your hair, moving the strands from the right to the left, and the left to the right.
Hold the strands with both hands. Move the leftmost strand to the center.