Dont know what adpater to get for sound!

Hey guys i know i shouldnt be posting this here but i couldnt post it anywhere else!
I believe i have an n16 nissan almera but when i went to change the head unit it doesnt have the adapters i expected and the adapter that i purchased fits into one of the slots but then their is just another port and i dont know where its supposed to go! can anyone shead some light on this or what adapter i need?
Picture below
 
have you tried to see whether it works withoutt the need to plug that somewhere?

besides whats that brown plug there?

P.S this picture is FUCKING MAHOOOSIVE
 
I tried to see if it would work without it and it didnt
The brown plug was the apparent adapter that i needed so i could plug it into my headunit
Sorry about the picture size should have maybe scaled it down first
 
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