What they are sarcastically trying to tell you is that you posted your question in the wrong forum.
But to help you, there are a couple ways to go about this, but I am not entirely sure of what you need. Do you want this field to be different every single time they post? Like a "now listening to" field? Or do you want it to stay the same for each post, like a "real name" field that would show up in their posts?
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