Lantern corps titles

[arkhamassassin]

If you’re talking about the Community Heroes, there’s more information on this thread:

"How Does One Become a Community Hero?"

Every once in a while, you may have seen topics highlighting a random box of goodies people received in the mail that included a letter thanking them for being a “Community Hero”. We’ve seen a few requests from other community members asking how they, too, can be considered Community Heroes. We absolutely value each and every person that visits the forums. We see many, many fans who are active and friendly contributors, and we are extremely grateful to all of them. We here at DC Universe work h…

If you’re talking about the titles that only say “Lantern Corps,” those users are members of one of the DCU groups, The Lantern Corps. There’s more info here