There are a few tags based on rankings or other qualifications that the staff will put into your account. For style ranks it is restricted to martial arts with a strong history of efficacy and quality control. To my recollection the only style/belt tags are for bjj (purple through black), judo (black belt) and kyokushin karate (black). If you click on the purple belt tab it will take you to a page listing the tags and requirements needed to verify their legitimacy (e.g. pro fighter).
Just a question. How did you put up 'Jui Jitsu Purple Belt' on your thing?