I've already tried How can I add map from website maps-for-free.com as my base map on QGIS 2.10.1-Pisa? with the adjusted filepath for the metadata.ini file but it didn't work. The FreeMap option doesn't show up in the dropdown menu.
Am I missing something or is this service not available anymore for QGS 3.4?
metadata.ini
and a list of what you have already done.