To load a WMS layer inside Geoclip, clik on above the map.
The next window gives you the choice between a predefined WMS server (the list is available in the drop-down menu) or enter the address of another WMS server.
Among the pre-registered servers, you will find Atlas 1 and Atlas 2, that give access to some maps from first paper versions of the Atlas of Belgium.
Click on a map title to display it and set the opacity of the WMS layer and of the thematic map from digital atlas (if applicable).
Note that the display of some WMS layers is restricted to particular zoom levels.