Hello Selvaraj,
on the shared HANA trial instance you have no privileges to access the Security and Traces functionalities. There is also no option to get the privileges.
You should use the MDC HANA trial instance (SAP HANA Multitenant Database Containers (MDC) scenarios now on trial landscape).
By the way, the shared HANA trial instance will be shut down on 1st July and will not be accessible anymore then.
Regards,
Florian