A quick search of this forum for "title" brought up a few candidates... you'll want to look in topics mentioning "Jimbo's Custom Status" hack.
Do note that the 5.x code hacking community died about a year and a half ago. You're gonna be pretty much on your own here. Also note that there are a number of pretty nasty bugs in the 5-series code, including potential security problems. Upgrading is really in your best interest.
Member Area renewals are $99, not $199.