How can I post a message for all of my users on the Home page?

To post a message or alert for users on their Home page:

Click Admin in the upper right of your account.
Click the Advanced drop down menu on the right side.
Select Create Alert Message and the Create Alert Message window will be displayed.
Select the Owner level from the drop down list. If User is selected, the message will be posted for an individual user. If Client is selected, the message will be posted for all users under that Client.
Select the specific User or Client by typing the name in the input box, and then select them.
Enter a Subject for the message.
Enter the Message.
Set an Expiration Date and Time for the message. This is optional.
Optionally Allow users to dismiss this alert before the expiration date by selecting the checkbox (this option is automatically selected when the Owner level is set to User).
Click the Create Alert button.

Please note that depending on the level of your administrator account, you may have access to the Group and Partner owner levels.