People Manager allows you to send a message to all employees, these will be shown on an employee's dashboard and can be emailed to all as well. You can also apply a rule to a message, allowing you to restrict to the message goes to. Go to rules for further information.
Click on admin in your top menu bar and within the system section click on messages.
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The message will appear on dashboards as below. When an employee hovers over the attachment the text box will display if you have added text. They can click on the attachment to open.
Messages for a group of people
You can create a message for a group of people using rules that you have set up. Speak to support if you do not have this function.
You will still have the option to choose email or just use dashboard messaging.
You will see a rules dropdown option and all rules that you have selected will be available for you to choose. If you wish to keep/change the message to everybody set the rule to all people.
Using an existing message
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