Login into your VPS or Server as root and type the following:
Now type in the security login message you for users to see when they login to your VPS or Server via SSH.
Try something like:
This computer system is for authorized users only. All activity is logged and regulary checked by systems personal. Individuals using this system without authority or in excess of their authority are subject to having all their services revoked. Any illegal services run by user or attempts to take down this server or its services will be reported to local law enforcement, and said user will be punished to the full extent of the law. Anyone using this system consents to these terms.