I can do the 1st and 2nd pop of the trick. My problem is, when I pop the yoyo for the second time to do double or nothing, the yoyo lands on both strings or sometimes the middle one. What should i do? Thanks 
When you do the initial trapeze try to keep the string as close to the back of your hand as possible, this will help keep the strings separated. The most important thing is to practice, practice and practice.
Try keeping the string taut after the second pop to force the yoyo to land on the far string.
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I was having the same problem, and a little trick that I figured out is that when you bring your throwhand across, quickly spread the thumb on your throwhand. This will push the middle string away from the outside string and make it more likely for the yoyo to land just on that string. Then quickly drop your thumb so you’re in a true double or nothing.