You'll need to wait until Bungie implements the name change feature. Bungie announced it should be around this time, but haven't given a specific date yet on its actual implementation.
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Thank you. I thought it was supposed to be implemented with Witch Queen.
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Bungie said sometime around Witch Queen's launch, so it should be soon but we don't know how soon soon is now. Hopefully it'll be in a few weeks, but as Bungie hasn't announced a specific date yet, can't really give specifics. It is planned to be released soon though, so just have to wait a bit longer, I think.