Want to clear the contact list from yahoo messenger list?

tell me how to do this and how do i get the info to make this happenWant to clear the contact list from yahoo messenger list?
First right click on their icon, scroll down to stealth settings and change them so that you appear permanently offline. Then click on messenger, top left on the messenger window , scroll down to preferences, click and scroll down to ignore list, click and in the next window add them to your ignore list and click o.k. Then go back right click on their icon and delete them. This way they are history