Here’s how:

1. Click My Account at the top of your Mail page, beneath your ID.
2. We want to make sure it’s you! Please provide your password.
3. In the first section of the page that opens, click Manage My Premium Services.
4. In the “Service” column, locate “Yahoo! Mail Plus”. Along the same line, in the column on the far right – “Action” –click View Service Details.
5. Now, above the “Service Summary” box, in the upper-right area of the page, click Cancel Service.
6. We’re sorry to see you go! In fact, that’s exactly what we tell you on the page that opens. We also leave you a space to supply us with a comment or two – or lots! We'd like to learn from your experience and find out why you're canceling. Afterward, click Continue to Cancel.

Here’s what happens when you cancel:

• Service is terminated immediately upon cancellation request, and a pro-rated refund for the unused portion of the service is issued upon cancellation.
• Your Yahoo! Mail account reverts to the free Mail storage size and other free features.

If you cancel your Mail Plus, your account turns into a free Yahoo! Mail account that you can continue to use…minus the Mail Plus features. If you’re trying to delete your Yahoo! ID and/or Yahoo! Mail account, check out the Account Deletion page.