First of all thanks for the fast reply.
I thought I couldn't use it but I just forgot to port forward it while using a DynDNS. So this is working.
https://github.com/TeamUlysses/ulx This is the official GitHub Repo of ULX and to add someone to the a rank like superadmin ulx adduser (user) (group). But I edited the wrong file and gave myself the group superadmin from GMod itself, while ULX uses another directory...
So everything is working now and I just forgot about the simple things....