I have installed a standard package which we don't need to use so i want this to uninstall how can i do that?
There is not an uninstall feature. You would need to either rollback to a backup of the system or (very carefully in consultation with support) remove the associated configurations, tables and forms being aware of dependencies.
Can you please tell me the process of roll back as it was not mentioned anywhere in documentation. If it is mentioned, can you please provide me a proper link so that I can go through.