I've seen a few people with a little gray line of text under their username when posting. Sometimes it has "- old" after it. I thought changing my motto on the about page would do it but it hasn't changed outside of my profile page.
English
#Offtopic
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12 RepliesYours says “chillin like a villain”. Do you not see it? Anyway to change it you go to the front page of the app, go to settings, go to Bungie account settings and then go to About me. You can change it there.
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1 ReplyThe text under your name is your status, your motto (the last bit of text in the image) shows up when people click on your profile.
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5 RepliesChange your status in settings. That should change it