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How do I change happy face symbol on Halo Reach to icon?

I signed up for Bungie.net and tried to change nameplate but still have green happy face. What am I doing wrong? Thanks for your help

Public Comments

1. Make sure you verify your bungie account through the email they send you. I believe that once you select the nameplate, you have to apply/save the settings by clicking a button on the site. Other than that, sounds like you did everything right.
2. Press start, then Armory, then go down to Emblem and change it. It's called emblem, not nameplate. Nameplate is a different thing.