not the username, but the domain itself.
Oh I see! Custom domain support is in the works, but currently in beta. Would you like to beta test it?
If so just pick a domain or subdomain you'd like to use on @Glue and setup a cname DNS record for it to user-domains.glue.im
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Oh my bad, now I see. Right now the way to do that is to just create a new account with the new domain.
Roadmap: I'd like to have the ability to add (or remove) domains under one Organization.
Signups are disabled right now while I'm fixing a spam attack, but I can help you setup a new one