Unlink Steam Account

Hello, could you please help unlink my steam account from my PoE account?

I linked my old steam account accidentally, and there is no button for me to remove/unlink/relink a steam account.

I checked forum and reddit, they told me to setup an email for my PoE account then try to relink, but I still could not find a relink/unlink button after that.

I just bought PoE 2 supporter pack and the early access is coming soon, please help, thank you ~