What you need and what needs to have been done:
Remove the plastics cover off of the ROL Board or (RF Board)

[caption id="attachment_212" align="aligncenter" width="200" caption="Xbox 360 Removal of RF/ROL Board Cover"]Xbox 360 Removal of RF/ROL Board Cover[/caption]

Then remove the three screws with the T8 screw driver.
[caption id="attachment_214" align="aligncenter" width="200" caption="Xbox 360 ROL/RF Board Screws"]Xbox 360 ROL/RF Board Screws[/caption]
Finally pull the board out. It is plugged in at the lower left of the board.
[caption id="attachment_213" align="aligncenter" width="200" caption="RF/ROL Board Xbox 360 Plug Location"]RF/ROL Board Xbox 360 Plug Location[/caption]

Lastly, plug in your new pre-modified board and put everything back together and marvel at the new addition to your custom console.