using Jhonny -five in node red to read the GPIO of BBB

I want to test with the GPIO of my BBB in node red . I am using the Jhonny -five library, but I don’t understand how to write the pin name in the corresponding field. For example I tried to turn on the USR3 led but it doesn’t work.

I think I should define the operation mode of the pins before using them, in my case as inputs or outputs, it would be mode 7.

In the Texas instruments web page there is the SysConfig tool to configure directly the operating modes of the AM335X processor, it is a very friendly software.

Could you help me with this query?