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