[NEED HELP] Created Subdomain in Cpanel, installed WP, server not found…

So I created a subdomain, and server's not found.
I'm not really a techy, I tried accessing FTP direct via filezilla and no luck there. I don't know what the whole DNS thing is, and I was playing around with adding the IP and name to A DNS, no luck there as well.
Would really appreciate the help to troubleshoot this guys. Thanks in advance.
P.S. I did it with 2 other domain via same steps in cpanel and it worked. This one in particular didn't work.

See original post by kennethtwk