No need to apologize. Current system isn't ideal and it seems that the settings for WMS layer is little bit hidden. We need to improve it.
Thanks, Petr
Hi,
I'm sorry for the troubles. The mentioned settings is available in left panel layer menu. https://help.locusgis.com/support/solutions/articles/47001108971-add-wms-map
The Basic version it's limited only in number of data and map layers.
Thank you
Petr
Iñaki Rodríguez Prieto