In the top nav bar, click on the "Inbox" dropdown. It will expand.
Click on the ( Menu) icon on the top right corner of the page. The menu will expand.
Then click on the dropdown that says "Inbox". It will expand.
Then click on Mailbox in the list of links.
A list of your Messages will appear.
Then click the checkbox in the right column of the Messages you want to delete from your list.
Then click the " Delete Checked" button at the bottom of the page.
Then click on the "Trash ()" icon to the right of the Messages you want to delete from your list.