How to plug in Goliton® AUX 3.5mm Cable

Hi all,

 

After finding a thread on here I bought the Goliton® AUX 3.5mm Cable, however I’m not none the wise as to how to actually plug the thing im.

 

I know it plugs in behind the head unit, but I don’t know how to get around there.

 

Any ideas?

 

Many thanks