Q: What can I do if I can't see the homepage?
A: Make sure to set the group permissions for this add-on.
Q: How to set the widget homepage as my landing page?
A: In the admin, section go to Setup > Basic options and change the index page route to cxf-homepage/
and your landing page will be your widget homepage.
Q: How to start with widgets? Where are they?
A: The widget homepage add-on is a set of widget positions to which you can add any widget from the XenForo widget system.
When you create a widget (in the admin section go to Appearance > Widget and click the button to create a new one) or use the existing one, check the map on the overview page to select the desired position for a widget (for instance [cXF] Widget Homepage: top).
You can add more widgets to the same position. It works with the XenForo widget system so it should be familiar.
NOTE: you don't have to use all positions. For instance, if you don't choose sidenav and sidebar you can use only the container and column positions. Or any other combination.