The yellow/green is more than likely the ground. You can always test it.
Without a tester,i assume you want me to use my hands.
But yes I think that the yellow/green is the ground, but my only question is that when I took the outlet out of the wall I saw that one loose so went ahead for the time being till I got a new outlet and placed that green/yellow into the slot near the blue(together) as that's where I saw the wire when i opened the outlet, but when turning back in the electric everything blew (all the fuses) in the fuse box, so went back and took out the yellow and electric worked fine for the rest of the apt.
As I'm assuming the yellow/green is the ground and blue is the neutral while the dark brown is the live and the other loose wire sitting in the box is to connect the light switches to the outlet, makes sense?
Or will I have the outlet pop? And burn the new outlet I bought?