Can you show me how to delete my account?
You cannot delete your account and if you want to create a new account again then that is possible but you cannot use the same name but you can make it almost the same as the previous name you use in another account. Take note, if you create an account that is similar to other forum user that has good reputation then you are most likely considered as impostor and either banned or received negative trust
1. delete all your posts;
Take note you can't delete posts under few condition (such as thread or post on locked thread).
This is true, I tried deleting some of my post that are old and low quality but it can't be deleted though some of it can be deleted but as ETFbitcoin said that post can't be deleted under few conditions. (Check the quote or the OP).