Wikipedia:Editing Your Own Page
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On Wikipedia, you're not allowed to edit articles about yourself (or your best friend, or your boss, or the skunk who lives under your porch). Wikipedia's long-held conflict of interest policy limits an article's contributors to anonymous strangers and unrelated randos for the sake of objectivity. But this can be frustrating to subjects of articles and those who love them, especially when information is wrong, outdated, or weird. If you're the subject of a Wikipedia article, you can certainly change your article without editing it directly.
The one stop shop is Wikipedia's FAQ for article subjects.