Hello Ramana
The SAP GUI can only be used to access systems with an ABAP stack.
As you have only installed a Java stack which is visible from the screenshot you have provided then access to the system using SAP GUI is not possible.
PI systems with ABAP stack is possible only if you install it as a dual stack, so in your case you might need to do the installation once again as a dual stack. As far as I know it is not possible to install a separate ABAP stack to the PI Java system.
Maybe you can check with these spaces.
Process Integration (PI) & SOA Middleware
Reagan