Thread:Anon421/@comment-31344797-20180906145731/@comment-31479589-20180906170304

That's simple. On your user page, just click the "Edit Profile", the one with a pencil icon on it. You can write anything you want there (like introducing yourself), and once you're done, click "Publish". You can check this link for further information.

Also, you mean editing your own user page, right? Because if you want to edit someone else's user page, then you need to tell them first why you want to do so, and you need to get their permission.