When viewing the Admin_Messages module, you have three options: View, New, and Settings, with the list of current messages being displayed.
View Admin Messages

Displays a list of Admin Messages. To the right of each Admin Message you will see icon links to edit and delete the Admin Message.
Create Admin Message

Creates a new Admin Message.
- Title of your message
This should be self-explanitory.
- Content
This is the body of the Admin Message.
- Active
Setting this to Yes will display the message immediately. If you would rather not display the message immediately, you may set this to No.
- Expiry
A message may be displayed for a certain number of days. Setting this to 0 will cause the message to never expire.
- Who can view this message
Your options are All Visitors, Registered users only, Anonymous users only, and Administrators only.
You can specify which user group this message will be able to view this message. Setting this to All visitors will enable this message for all users.
Admin Messages Settings
- Items per page
This will limit the number of messages shown per page
- Allow searching of inactive messages
If a message has expired and you still want the message to be searchable, check this option ⁞