The easiest way for people to get your contact information is for you to send it to them. There are several ways to do this:

1. In the main Yahoo! Messenger window, open the "Actions" menu and click "Send My Contact Details"
2. This will open a dialog box for specifying the person to whom your contact details should be sent. The dialog box has two tabs: "My Contacts," for specifying one of your current contacts as the recipient, and "Other Contacts," where you can enter the Yahoo! ID of a user who is not on your Messenger List.
3. After you pick a person to receive your contact details, click "Next" to open the Contact Details dialog box.
4. You can edit or add to your contact details before sending them. Click "Save and Close" when you are done, and select the contact details you wish to send by clicking the checkbox for each detail or by clicking "Select All."
5. Then click "Finish" to send them. Your friend will receive an instant message saying that you are sending your contact details. The message will contain links to let your friend to either "Accept" or "Decline" that these details be used to create an address book entry for you or that they be added to your entry, if one already exists.

You can also send contact details during an IM conversation. Just open the "Actions" menu, and click "Send My Contact Details." You don't have to specify the recipient of the contact details. Otherwise, the process is the same as above.

Another way to send contact details is to right-click the name of a contact in your Messenger List, and then click "Send My Contact Details." The recipient of your contact details is already selected, and the rest of the process is the same as above.