In your help you state the following:

Page Select tab
Use the Page Select tab to choose the page you want to edit. To start with, your current workpage will show as the Current Page. Select another current page from the drop-down page list box. Notice that as you select, you see a preview of the page in a pane on the right. When you click OK, the page selected will become the workpage. But in the meantime, the current page is the one other Page Editor operations will work on.

There is a picture on the left of the article.

I coild not find the Tab but I do see the Page Dropdown box.

Is the Tab gone?

The tab is still there, but perhaps you don't have the Page Editor open. From the tutorial: "Click on the Page Editor icon on the left tool-bar to open the Page Editor."

If you don't have that icon (button) displayed, use the Main Menu: Page > Page Editor.