reverse DNS entry

[hdf]

hi

i get the following from my registears :
The Nameserver at 64.xxx.xxx.xxx (ns1.mydomain.co.za ??) does not appear
to have a reverse DNS entry. This means that this nameserver does not
comply with 'co.za' registration policies and can not currently be used.
A 'dig -x 64.xxx.xxx.xxx ptr +pfmin +time=9' gives....
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 61921
;; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUERY SECTION:
;; 64.xxx.xxx.xxx.in-addr.arpa, type = PTR, class = IN
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

can any one hlp me to set up the Reveres DNS on a pleks control pannel i'm runing a unix virtual server.....please contact me if u need any other infomation