As you can see the setup looks a lot like ArcView, and just like ArcView it is quite easy to use.  Starting from here, a user would zoom into where they would like to enter data using the supplied zooming tools.  When they are zoomed in far enough (they must cross a threshold scale of 1:100,000), they can click the button to find the stream observations entry tool.

Once the "Mapping Tools" button has been selected, the user has the following tool bar to work with:

With this toolbar, the user can select the green circle button to digitize a new point, the X button to delete a point, or the report button (looks like a piece of paper) to view data entered at an existing point.  The question mark button brings up available MapGuide help.