Currently, you cannot manually delete a account. You will have to get a Moderator to get your account deleted.
What do I do to delete my account?
To delete your Socratic account, all you have to do is message Stefan your account name, account email, and the reasons why. Then, he will take your "application" into consideration. After that, he will summon his magical elves to mark your account to be deleted. After that, the Engineering Masters will come and delete your account.
Please note, if your account is deleted, the questions and answers will remain on Socratic. They will not be deleted.
If you want your questions and answers to be deleted, make sure to mention that in the note.
Alternatively, you can follow the instructions laid out here, but chances are that it's going to take longer.