[Can't remove or change email address]

First of all, I have two accounts related to funtoo.org, and I want to remove old one → Can't find any option to close an account.

So, I've tried to change my email address associated with the old account, but on the forum website, the button to change my email address directs to 'reset the password' page.

How can I close my account(forum AND wikipedia), or change my email address from forum website?

[Any idea to remove old account of 'wiki', 'forum'?]

I'm really looking hard to find option of 'opt out', but couldn't find any.

I forgot I already have a account, and re-signed up for one.