thanks for the quick reply !
So there is no need for entering anything under service/providers anymore ...
So i would asume it had to work already because i followed every step above. Except i do not need MO number so i deleted the '&from' part from the url.
Entering the url wich checks clickatell parameters, gives me the wanted sms (http://api.clickatell.com/http/sendmsg? ... &text=test)