You're not saying what kind of problem you're having doing this, saying what steps you're taking, or even asking a question about what you're doing. I think that's what confusing.
He asked what you mean by exporting the playlist, even underlining exporting, and that's still unanswered.
This is a really basic function. You add the files to the playlist in the order you want them, and then they're in the playlist in that order. What's going wrong?