How can I create a simple tab? I'd like to create a tab like the one show in the screenshot for a simple contact address list.

 

or see this drupal site HERE

I have "contact one," "contact two,"  and "contact three."
I want to put some text under each contact section.

How can I achieve this?
I think you want to use QuickTabs. I am using it on my website (check near the bottom). It seems to be exactly what you want to do. Under each quick tab, you can display nodes, views, blocks or other quick tabs.