To link to a social networking account, such as Twitter or Facebook, follow these steps:

1. Go to Yahoo! Profile and log in.
2. Go to Settings.
3. Click on the pencil icon next to "Linked Accounts."
4. Click the icon for the social networking site you want to link.
5. Sign in with your username and password if you are asked.
6. Once your account is linked, the box will slide to the right, and the account will say that it is linked.

To unlink your account:

1. Go to Yahoo! Profile and log in.
2. Go to Settings.
3. Click on the pencil icon next to "Linked Accounts."
4. Click the icon for the social networking site you want to unlink.