Delete in box emails on my desktop.

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I have not had any success with the methods on Google.  Help

• How are you trying to access your email? through the website or a third party email app like Outlook,Thunderbird, or Apple/Mac mail? or through a device like your phone, or iPad, etc.
• Are you getting any error messages, and if so what are they?
• Have you migrated to Yahoo! Mail? you'll need to login here: https://login.yahoo.com or https://mail.yahoo.com with your comcast.net credentials.
• If you're a new Comcast customer, you won't have a comcast.net email address.