Hi @HimashAkalanka ,
How long ago did you change it? It may take 24 hours for the change to fully propagate. Also, depending on your platform and your registrar you may need to change A and CName records in your DNS zone file.
Hope this helps,
You can use the following instructions to edit DNS for your domains at any time: https://godaddy.com/help/manage-dns-zone-files-680?.