Secondary URL has been changed for site configured for secondary URL...:(

Our site is currently down becuase....
DNN installation for our site was configured for secondary URL and was getting redirected. Unfortunately we overlooked the email from our host about the impending change of teh secondary URL....now we can't go to our admin console and change the settings to point to the new URL. (Also the actual developer is not accessable anymore and I have a limited knowledge about DNN)
Could I request you to please either send us the step by step procedure to make the required changes to get the site up again . I did try to log a ticket to the host comapany and was told that I have to try to go into the SQL database that DNN is using and in one of the tables search of the URL it is coded to point to. It should be in one of the tables/columns. OR go to this forum and may find a member very familiar to DNN and may able to assist....

Thanks in advance
Jas