The Navigation menu is at the top. Hover the mouse over a menu item for information on its function.
If you find yourself a little lost home will take you back to the beginning.
Another way to explore is to use the individuals index which lists everyone, grouped by surname. Clicking on a person's name will bring up a page with their details.
Similarly there is a families index.
Perhaps the easiest way to get started is with the Family Tree diagrams, you will find an index of diagrams under trees.