Summarize this article in one sentence.
Tap the Outlook app icon, which resembles a white envelope with a blue "O" on it. This will open your Outlook inbox if you're logged into Outlook. If you aren't logged in, enter your email address and password when prompted. It's a pen-and-pad icon in the top-right corner of the screen. A new email form will appear. If you'd prefer to forward an email instead, tap the email that you want to forward, tap the backward-facing arrow in the bottom-left corner of the screen, and tap Forward in the menu. In the "To" text field, type in the email address of a person to whom you want to send the email. This is not the person that you're BCC-ing. Doing so will cause it to expand into two distinct "Cc" and "Bcc" fields. It's above the "Subject" text field. Type in the email address of the person to whom you want to send the email via BCC. In the main section of the email window, enter your email's information. It's the paper plane-shaped icon in the top-right corner of the screen. Doing so will send the email to all email addresses listed, though only the email addresses in the "To" field will be visible.

Summary:
Open Outlook. Tap Compose . Enter a recipient's email address. Tap the "Cc/Bcc" text field. Tap the "Bcc" text field. Add an email address. Write your email. Tap Send .