The welcome message is displayed on the logon screen, directly under the User ID and Password text boxes. A welcome message can be entered and maintained only by an administrator. It will persist across reboots, is limited to 1000 characters and can contain URLs and other HTML codes.
Enter the message into the text box.
Click Save.
Modify the message in the text box.
Click Save.
Delete all text from the text box.
Click Save.