Problem with Qsys when creating PIO

I am beginning to create a hardware with Qsys.

The system that I want to create has 4 ports: clk(input), reset(input), a1(input), a2(output).

I added a nios processor, a on-chip memory, a jtag uart, a pio_0, a pio_1.

I also followed step by step as the instruction of creating the simplest nios program said.

I set pio_0 to be input, pio_1 to be output in Basic Settings/Direction.

However, when I generate this hardware, it only has 2 ports: clk and reset.

I saw that 2 PIO components have external_connect but I don't know where to connect them.

Would you please tell me why I can't create 4 ports?