Send data to multiple users

I am trying to send data to multiple users that is entered through a form.

For example,

    <textarea id="textarea1" name="note"></textarea>
    <label for="textarea1">Note</label>
    <button type="submit" id="submit-btn" button>

If I submitted this from user1 how will I make it available for user 2, 3, and 4 but not for user5. Ideally I would want another input for username and when submitted it’ll show for the specified users.