Removing the background of an image.

[God]

Hey so I am desperately trying to remove the background of the below image. It was supposed to be a render but it didn't turn out that way : I am trying to use the eraser to erase the weird squares in the background but I keep ruining the image. Any help will be appreciated. 

https://imgur.com/a/ulKnT
https://imgur.com/a/ulKnT

Thanks!