That is a really bad idea man. Trade the charts? On XIV and VXX? Are you under the impression that supply and demand drives their price? As i960 said, you really do need to research what they are before dipping a toe in the water. I suggest you read the full prospectus on these products, as well as absorbing all the free information that's floating around on the internet about these trade account vaporizing products. Charts are completely useless here.
Like I say, haven't traded them myself. But when I look at the charts, they look "tradable" like other issues. When you trade the chart, you're making plays based upon "buying and selling". That's all that really matters. (If you don't "get that", then suggest you not bother about being a chart trader.)
BTW... charts are almost always "not useless". (I would have said "never useless", but I thought of one which is mostly useless.)