Does anyone have a good solution to deleting a Yahoo account? I've got one that is 99.9% spam mail now but I've never deleted it because If I remember correctly

Does anyone have a good solution to deleting a Yahoo account? I've got one that is 99.9% spam mail now but I've never deleted it because If I remember correctly someone else could open up that email in my name and continue to get my emails. They also don't support automatic email forwarding if I remember correctly. It remains as the dark spot of my email accounts.