To create Invisible Status of Yahoo Messenger follow these steps:
1. Log on Yahoo Messenger
2. Go in to the meniu: Messenger >> My Availability >> Invisible to Everyone
3. Done
If you prefer to make your ID offline status or invisible status for a specific ID forever ( your ID is permanently offline or invisible for chosen ID from your Messenger list) follow these steps:
1. Log on Yahoo Messenger
2. Go to a chosen ID >> Sealth Settings >> Appear Permanently Offline to user
3. Done
Enjoy!