Help with aftermarket stereo

Hi all, wondering if anyone knows where to connect this red wire out of the back of my stereo. I bought a Corsa 07 plate (UK) recently and it has a Sony wx 900bt however it doesn't work. The red lead is hanging from around the passenger side foot well. I know this needs to be connected into a powered source either from the cig lighter or in the fusebox. I can't find a way to connect it to the cig lighter, and I don't know where it would plug into on the fusebox. Any help wlis massively appreciated as I have a lot of driving to do over the next few weeks and having music will make it a lot less arduous.

Hi all, wondering if anyone knows where to connect this red wire out of the back of my stereo. I bought a Corsa 07 plate (UK) recently and it has a Sony wx 900bt however it doesn't work. The red lead is hanging from around the passenger side foot well. I know this needs to be connected into a powered source either from the cig lighter or in the fusebox. I can't find a way to connect it to the cig lighter, and I don't know where it would plug into on the fusebox. Any help wlis massively appreciated as I have a lot of driving to do over the next few weeks and having music will make it a lot less arduous.