Q: How can I delete all emails on my me.com account. How can I set spam controls.  Thank you for your help

Go to icloud.com, open your Mail and delete them in groups of about 500 at a time, otherwise it will hang.  Click the first, then scroll down and shift-click the last and press your delete key.  When your done, click the gear icon on the lower left and empty the trash.

Welcome to the Apple community.

Highlight them all and hit the delete button.

Use your rules settings to manage your mail (mail > preferences > rules)