Check the following link on how to modify Nameservers http://cp.pubdomains.in/kb/servlet/KBServlet/faq455.html

Are you getting this error when pushing or transferring the domains ?
[7] Error Message: <domain Name> cannot be moved to another Customers account as the associated Domain Registration service is currently under the Money Back period.
You can transfer the domains on 5th Day from registering. We have a money back period of 4 days and during this time you may cancel your domain registration for a small charge. Usually its $1 to cancel the registration but it may vary depending upon the TLD.

This is a temporary error and it will clear off on its own in 2-3 hrs.  Usually this occurs when there is more load on the system and the order are queued during processing.

Pushing domain to another Pubdomains.in accounts is extremely easy and instant.
Get the customer username (e-mail) and Customer # of the new contact and after logging into your Pubdomains.in account
Select the domain you want to move and then select “Move Services”
You can check the details on link below
http://cp.pubdomains.in/kb/servlet/KBServlet/faq450.html
You can move the domains to any of the resellerclub resellers for free using the above method.

The following are the default Pubdomains.in Nameservers. You will need this if you are using services like Domain Forwarding and  Managed DNS. If your DNS is not set to below the above services will not work.

Name Server: NS1.PUBDOMAINS.IN
Name Server: NS2.PUBDOMAINS.IN
Name Server: NS3.PUBDOMAINS.IN
Name Server: NS4.PUBDOMAINS.IN

You can change the Nameservers of your domain in bulk.
Check the following link for details

http://cp.Pubdomains.in/kb/servlet/KBServlet/faq464.html

Here the details on bulk locking and unlocking

http://cp.Pubdomains.in/kb/servlet/KBServlet/faq465.html

For details on all BULK actions see this page

http://cp.Pubdomains.in/kb/servlet/KBServlet/cat126.html

If you have added funds to your Pubdomains.in account and the domain registration has not completed, do the following:
Login in to your account at Pubdomains.in.
Goto My Billing >> list pending invoices and
debit notes >> Select the domains >> and click on Pay button.
Adding funds to your account first enables you to use it as you would use a debit card. If you added more funds into your account you can use it anytime you want to register a domain with us.

Privacy Protection is not available for the following domain name extensions:

.US, .IN (including .CO.IN, .NET.IN, .ORG.IN, .GEN.IN, .FIRM.IN, .IND.IN),
.EU, .UK – Restrictions imposed by the Registry Operator
COOP – Restrictions enforced through ICANN’s contract with the Sponsor/Registry Operator.

If its not one of the above extensions then you can contact support to look at your domains.
Also important things to remember when using privacy protection

If you wish to have your domain name Transferred away from Pubdomains for some reason, you need to first disable the Privacy Protection and then place a transfer request …

In order to view all your domains, Login to your Pubdomains.in  Account
Goto Products >> Domain Registration >> Search.
Here you can select your search criteria and for “Order Creation Date” select “All time” to view all your domains and finally click on Search