Programming of Redbear Blend v2

I am working on Redbear Blend v2. The programming IDE is arduino, the example code I got is from the given github link: nRF5x/nRF52832 at master · redbear/nRF5x · GitHub
I am having trouble in understanding the functions used in the examples, I am familiar with the normal arduino programming. Any help is appreciated.

I am having trouble in understanding the functions used in the examples

can you be more specific - which function, which example?