Tap the Yahoo Mail app icon, which resembles a white envelope on a purple background. This will open your Yahoo inbox if you're logged into your Yahoo account.  If you aren't logged in, enter your email address and password. If you have multiple accounts logged in, you may have to select an account before continuing. Tap and hold a spam email until a checkmark appears to the right of the email, then tap any other emails that you want to mark as spam. It's in the bottom-right corner of the screen. A pop-up menu will appear. Skip this step on Android. You'll find this option at the top of the pop-up menu. The selected emails will be moved into the Spam folder. On Android, you'll instead tap the shield icon with an X on it at the bottom of the screen. It's in the top-left corner of the screen. A menu will appear. You'll find this option near the middle of the menu. Doing so will delete the Spam folder's contents.

How would you rephrase that briefly using Vietnamese?
Mở Yahoo Mail. Chọn email rác. Nhấn vào dấu ⋯ ở góc trên bên phải màn hình. Nhấn vào Mark as spam (Đánh dấu là thư rác). Nhấn vào nút hình ☰ ở góc trên bên trái màn hình. Cuộn xuống và nhấn vào biểu tượng thùng rác cạnh thư mục Spam. Nhấn vào OK khi được hỏi.