When I first joined MyOpera - 5 years ago - the forums would let you enter anything at all for your location. When they initially went to the new "community", you could still enter anything at all - and if you left it blank then they listed "Atlantis" as your location. At some point though, they changed it to a dropdown box that says "Country" and you choose from the list ...
Other than myself anyway, if you see someone on the forums with an unusual location, that means they haven't changed it in the last year or so. Thus ... well, like bluesman2333 where his location says "in a pot of thick marinara", for example. (That was a joke about his avatar, if you must know.)
But besides that, maybe you just live in a location that didn't make their list. I don't see Easter Island, I'm sure there must be other places which aren't on the list. Maybe you're posting from Antarctica or Betelgeuse ...
Or maybe you just want to fix your time zone. While I'll only describe location, this technique can probably be used on time zone, forum posts per page or other such settings. I've managed to help some people to revert to the old blog designs too.
Anyway, say that bluesman2333 is tired of that pot of thick marinara and wants to change his location to Easter Island. (Not that he really lives there, but it would go with his rabbit avatar. ) He would click on "My account" at the top of the page, then on Edit my profile, and finally on View > Source. Okay, that looks like a complete mess, but not unintelligible.
If you scroll down a bit (or use Ctrl-F Find) you can find the following:
(Yes, I have tidied that up.)
Pick somewhere that you can find it - either right below the top or else where it would be listed alphabetically - to add your option. Taking the first choice as easiest, he'd add the code for his desired option as follows:
(No, he doesn't have to tidy it up. Just so long as it's a complete option tag and doesn't appear in the middle of another tag.)
Then he clicks on "Apply changes" (up in the toolbar) and switches back to the actual page. The "Country" dropdown now looks like this:
He just selects his option from the dropdown, then scrolls to the bottom and clicks on Save profile, and there it is.
For people who are wondering how this stuff works - the website cares about the value="Easter Island"[/url] part of the tag, the rest of it is to make sure it looks correct when you are choosing it.