Only then I setup HTML Editor via Insert - Webassist - HTML Editor and started with Site Settings. From there I immediately selected advanced.
I really have no idea what I might have omitted, since I have tried any possible combination of settings. Most of them with clean files.
Is there a way of setting it up without this (in my case) obviously non-working interface, as my colleague suggests?
i understand it's not working unless your effords?
mine isn't working, tried everithing!