How to access the pins to modify bits in e2 studio?

Hello,

I am working with an TB-S3A6 board and I need to configure VBATT wakeup control function. The TB-S3A6 user's manual describes the steps required to set the VBATT wakeup function by accessing some bits and changing their values. My problem is that I cannot access the required bits.

I have seen in a renesas synergy example a way to access those bits using "R_SYSTEM->", but when I try that in e2 studio, only some bits are shown as options to be accessed.

Specifically, I want to access to the "VBTCR1.BPWSWSTP" or "VBTWCTLR.VWEN" bits to start the configuration. The IDE e2 studio shows the following options:

I would appreciate your help. Thank you.

Marcos