I suggest you use an on-your-computer version of TurboTax if you are going to stick with this kind of investment. TurboTax Deluxe is good. Check Sams or Costco.
It is possible to do this stuff by hand using information from the graphic guide that came with your package, but it is not simple -- especially if you plan to get more MLPs.
In direct answer to your question, your number from box 19 is a distribution, and not a dividend. It does not get reported on your taxes. It does affect your basis, which is being tracked for your by NRGY. It will affect future taxes (I am presuming you still hold NRGY).
Box 6A and 6B 7, 8, 9* would go on your taxes, but I think those are probably blank(or zero) on your K-1.