With edit mode enabled click "Add an activity or resource". You will want to do this where you want the Announcement tab located.
3
Select the Forum activity.
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Name the new forum "Announcements".
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Click the 'Expand all" button.
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Make sure that the setting "Subscription mode" is set to Forced subscription under the "Subscription and tracking" tab. This will force students to get notifications when you make a post to the forum.
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Once you have set the subscription mode, click "Save and display".
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To add an announcement, go into the forum and hit "Add discussion topic"
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Type out your announcement in the forum.
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Once you are done hit "Post to forum. Once you post the announcement students will receive a notification that you made a post to the forum