Unable to create user through hana studio

Hi Experts,

I created a system with Hana instance using my Hana trial account. Now I would like to create users and roles from the studio and want to customize my

applications deployed with Hana trial account.

I am trying to create users like this in the studio:

In Systems view -- > Hana system --> Security ---> Users (right click) ----> New User

But I am getting the below error :

You need privilege USER ADMIN to perform this action.

If I am creating through this query "CREATE USER <username> password <userpassword>;" , getting this error :

Could not execute 'CREATE USER test_user password 123456' in 158 ms 170 µs .

SAP DBTech JDBC: [258]: insufficient privilege: Not authorized

Can any one help me out on this :

Regards,

Prasanna