Just start playing the weekly 18-HOLE SINGLE PLAY tournament each week, and report your scores here. It's is that simple. The original post has a few more details.
Those same scores are used to determine your handicap. Because you don't have any in your score history, it will take your first 4 scores to establish a handicap. Additionally, now that we are in the 2nd round of this tournament, your first tournament will be the next one.
Still... start posting your scores here each week so we can get you a handicap established.