@_az Thank you for that explanation, that helps me already a lot, I will visit this 2 websites to get more information about getting a SSL Certificate.
@Osiris You are right - it is NOT in the DNS Backend possible, it is only in the Confixx adjustable. In the DNS Backend I’ve only added DNS-Record Verification TXT Part.
You both helped me to get it done !! MANY THANKS to @_az and @Osiris !!