自分のメールアドレスが認証済みかどうかは、どうやったら確認できますか?

Links to Relevant Wiki Articles(s):

• https://en.scratch-wiki.info/wiki/Email_Address_Confirmation 

Within the Account Settings menu, click the "Email" tab. If your account is confirmed, there will be a green check mark next to your email address. See below as an example:  

Email addresses are confirmed by clicking the Confirm My Email Address button inside the email you receive or clicking the link below the button.