How do i take out the stereo head unit on a 2006 nisan altima?

[PaulMitchel]

I need basic or specific details...im trying to re-install the original back in it...thank you!
Thank you luxury...what happened was i had an after market dvd/cd head unit and it broke....i also had subs installed.....how so i take the plastic off and install the original and subs

 

[LuxurySport]

You need to remove the trim around the head-unit and remove the bolts.