You just need to be the owner of an Enjin website with an advanced plan, then you're able to change your Custom URL c: But tbh, not worth the effort, it will become available for normal users soon c:
"Also note. This feature is currently only available to owners of websites that are on the Advanced or Ultimate plan, regular users or site admins don’t have access yet, but they will have access in the near future." - Enjin
"regular users or site admins don’t have access yet, but they will have access in the near future."
I don't blame you man! When I wome up I instantly received a message and I was one of the first people to get it done, with assistance from someone else, hope it goes well for you! I'm still waiting tosee that SRMod tag also!