How do I "... please contact the administrative team for this website." as suggested in the "Your Rights & Consent" page?

Look in the site’s footer or “Contact/Privacy Policy” page for an email or form. If none, try WHOIS to find the domain owner’s contact.

If you actually want your data removed, I believe that requires an email to the company. If you just want your forum account closed I could "ban" it to prevent anyone from possibly guessing the password - that's the extent of a moderator's abilities over accounts.

Since about half of the features I installed Opera to utilise, do not seem to work for me, and asking questions here to resolve what are probably my installation errors rather than bugs, but an overzealous moderator with a stick... (I see from his history that I'm not the first or only newbie he has seen fit to exert his authority on) sees fit to override my titles and locations of questions, meaning I'm never gonna get any answers here. (I can't even find the place where he stuck my second post having unilaterally decided it was an aria bug. On no good basis I might add.)

I might as well ditch Opera and look at vivaldi or otter. There seems little point leaving what will be an unused account lying around. So I'm trying to do what is suggested on this page:https://forums.opera.com/user/browseruk/consent.