The titles under the UN are like badges which indicate certain things such as if you are part of any group of IF (CrazyCreative, Bollycurry, FF graphicer, FF editor) you will have it under your UN so that other members can know that you belong to that particular team. Furthermore if you win any banner contest you will also get a title under your UN like "XYZ Banner Contest winner". This is to award your hardwork and so that every time any member around IF clicks on your profile they will come to know about your achievements.