Nishita,
You should run the TN DB Scripts depends on what database are you using (Oracle or SQL server or DB2 etc…)these scripts are located in the webMethods installed filesystem c:\WM6\common\db\scripts\create folder.
Run those scripts successfully and create the functionalAlias for TN using the IS AdminConsole page and enter the TN DB information and test the Alias it should run successfully.
If you dont have enough Admin privileges for doing above work, please take help from your WM Admin or DBA for make it work.
HTH,
RMG
#webMethods#B2B-Integration#Integration-Server-and-ESB