domain.com problem

i bought a domain at domain.com yesterday(coz i cant buy cheap domains at godaddy & namecheap using paypal)my problem is that i cant change the nameservers to point it to my own hosting...whenever i go to domain central panel and it said my domain is the primary domain and whenever i try to click "+" to edit nameserver(see in the pic)did i do something wrong?... (i tried to contact their support but until now...noone answering...)

help pls... :Cry:

Did you tick the checkbox before trying to change NS ?

i cant tick it its disabled as you can see on the img its in gray...

Well then wait for 72 hours and then try again. Can you see your domain name whois ?