I already receieved an email that my nameservers are change. But for my hosting on 000webhost, it is showing waiting on nameservers. I tried to do it many times but its not working.
What is your domain?
It may take a while for the nameservers to propagate. If the domain does not connect to the nameservers, then you may want to start over by reinserting them.
Let me know if it works! 
Austin
I have parked my domain and pointed the servers to the correct directions but still “waiting for namerservers”.
What do I have to do?
ideah.org
Yes. How do you get that domain information? In green letters
Google DIG DNS 