As nordstar said, spells posted on here can only be edited by an officially declared editor and then approved by a moderator and or; Petrarca the websites administrator, but after a spell is posted it cannot be deleted.
edits have been answered but deleting spells is only done by the site administrator. the only spells however, that i know of which have ever been deleted are ones that encourage bodily harm. i remember a few years ago mailing Pet about vampire spells encouraging people to cut themselves [not going into detail, but essentially kill themselves] they were deleted within the day. if you find a spell encouraging murder, suicide, or other dangerous activities, inform Petrarca. if the spell has poor spelling/grammar, an editor can fix it. a spell to become a werewolf or other non-working spells can be down voted, it's highly unlikely they will get deleted. if you find one that is dangerous [drink bleach, cut yourself, shoot them with a silver bullet...] report it immediately.