How do I change the weather icon?

Hello friends

Can someone explain to me the Association between the Premium Weather Icon Labels and the Icon Codes generated by Weather Display?

I tried very hard to understand the association and communication between WD generated Codes and description labels and WDL Icon Output but envain. Sometimes there is just no Icon appearing.

I am using the solar descriptions in WD associated with the solar percentages. In WDL configurator I fill in the URLs of my Premium Icons like http://jachen.homedns.org/wdlive/sonne.png. BUt there are circumstances where no Icon is displayed.

I thought there might be something wrong with the icon images and entered the same icon-URL for all labels expecting to see that Icon for
any solar description. But it did not display.

Is there somwhere sort of a tutorial to understand the cooperation between WD and WDL Icons? Any hint would be very much appreciated.

My Weather-Website: http://widen-online.ch/

Best regards from Switzerland
jachen