We will start with a simple and basic task. You would like to select some from Map services in Micka catalogue and add it map window.  In catalogue are stored data and accessible trough OGC services (WMS, WFS, etc.). You have push icon for adding  Map service into Map composition, among source select catalogue Micka and fro selected data source push button  + for adding the map to map window. See image

Then new menu appears and you have select, which layers, from these services, you would like to add to Map window and again push +

and it is done.

Please any comments about potential problems are welcome

We will continue

The important message, the mobile application is working with the same philosophy.