There are two ways in which you can interact with this genealogy:
Once at an entry on the tree, you can view more detail about that person by clicking on their box. You can then automatically traverse across to other people in the tree by clicking on their generation/position number (e.g. 3.1). This number denotes generation (top-to-bottom) and position (left-to-right) within the genealogy. For example, 3.1 means 3rd generation (as measured from Mayer Amschel) and 1st position chronologically within that generation.