All the PIC16F15376 I/O pins are accessible at the edge connectors on the board. The image below shows the kit pinout.
Figure 1. PIC16F15376 Curiosity Nano Pinout
Info: Peripheral signals shown in the image
above such as UART, I2C, SPI, ADC, PWM, and others are shown at specific pins
to comply with the Curiosity Nano board standard. These signals can usually be routed to
alteriative pins using the Peripheral Pin Select (PPS) feature in the PIC16F15376.