Romanian deadlift setup is with two dumbbells. 

Feet should be under the hips and dumbbells in front of your body. 

With the knee soft, shoulders pull down and back and belly braced. 

Send the hips back and slowly lower the dumbbells to mid-shin, or until you feel a slight stretch in the hamstrings. 

Keep the dumbbells close to your body, and shins remain vertical. 

Squeeze the glutes to stand and finish the rep.