Adding Tooltip

Question

I am having trouble finding an easy to fiollow instructions for adding a tooltip. I feel confident this is the place to come.  My assignment is
Create a form with three LinkLabels that link to any three web sites you choose. When a user clicks a LinkLabel, link to that site. When a user's mouse hovers over a LinkLabel display a brief message that explains the sites purpose. After a user clicks a link, move it to the top of the list and move the other two links down, making sure to retain the correct explanatoon with each link.

Thanks for any help
Vic