On the first link page 8 is for install or replace a fan.

On the second link page 37 shows the front panel header which is no help because the connector from the case is just going to plug into it.

You want to be determining what's going on in the bios and you can make selections there as to what you will have for the front panel sound, you can make it HD or you can make it AC97 and that choice is made in the bios.