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Aye! There's no set way of doing it! Have a flick through some current character bio's for some inspiration! Some are fancy, some are more simple! You'll find something that works for you!
Just in case you haven't seen it, this guide is the best place to start your journey on Chaos. But of course as Zachariah said we are always open to questions and willing to help!
I assume you mean in a post given your avatar, so it's very simple! The picture icon, the singular one, or Ctrl P opens up the image menu. You can upload a file from storage but the most common way is to link an image. You have to make sure to get the link for the image itself though, not wherever you've found it, so your best bet is to open the image in its own tab and copy the link there.