We don't have any permanent procedure to select regular chat members as VIPs.
Chat Administrators & Chat moderators regularly keep an eye on members who are spending more time on chat regularly, how active they are in main/ lobby, positive behavior etc. and then we select some of them as VIPs.
99% of time, only people who have been member in more than 3 months will be selected for this post.
Also only members who come to chat regularly with same username will be eligible for nomination, instead of changing usernames everyday.
Take risks in your life. If you win, you can lead. If you lose, you can guide. ~Swami Vivekanana