I know that qustiosn was was asked before.
I have tried to find an OSM key on the web, but without success.
I know that I need to enter the API key by going in this order: web- OpenLayers Plugin-OSM/Thunderforest-Set API KEY
How and where can I find the API Key that need to be paste in this window?
I opened an account at Thunderforest Console, paste the API key, but it did not solve the problem