あなた don't. But あなた can use the
link link at the bottom of any page to write to the staff to request to have your account deleted.
If あなた intend to open a new account, please make sure to contact the staff first BEFORE あなた create a 秒 account, as multiple accounts from the same IP address can get あなた banned (and it is much もっと見る work to get reinstated after a ban).
It sounds, though, like just not using the site anymore would suffice for you. あなた don't need to 削除 an account for that.