How do u block contacts on yahoo messenger?

You must delete the contact from your Messenger List in order to ignore them. When you ignore a contact, you always appear to be offline to the contact. They can never view your status or send you an IM.

To ignore a contact:

1. Click the "Messenger" menu in Yahoo! Messenger and select "Preferences."
2. Click the "Ignore List" category.
3. Select the option labeled "Ignore only the people below."
4. Click the "Add" button.
5. Enter the yahoo_user_id of the contact you want to ignore.
6. Click the "Ignore" button.
7. Click "OK" at the bottom of the window.

You can ignore up to 100 contacts.

Please Note: You can remove a contact from your Ignore List by selecting the yahoo_user_id and clicking the "Remove" button.

To ignore anyone who is not on your Messenger List:

1. Click the "Messenger" menu in Yahoo! Messenger and select "Preferences."
2. Click the "Ignore List" category.
3. Select the option labeled "Ignore anyone who is not on my Messenger List."
4. Click "OK" at the bottom of the window.