Interfacing Bluetooth with de10 nano

Those modules have a simple 8 pin connector.

Two power lines, four status/enable lines, and a UART RX/TX pair.

So four GPIO pins and two (RX/TX) lines for a standard 9600/38400 baud asynchronous UART module.

So you will have to implement some logic on the FPGA side (UART, GPIO ports) and tie it into the processor side of the DE10-NANO.