I'm trying to add Openstreet Map (OSM) to QGIS3 (Ubuntu 16.04) as a background WMS layer. I found a list of OSM WMS Servers, and a WMS tab in the new Data Source Manager (Ctrl+L).
But after clicking the new button and entering the URL
http://www.osm-wms.de to Create a New WMS Connection, I get a new connection called
osm, which cannot be used. I can't expand the connection in the index pane as with other things like PostGIS, or add anything from that connection.
Can someone provide some pointers on how to manually add the WMS layer (ideally without using plugins)?