Mute button stuck and Wi-Fi signal very low after repair.

Well, I wanted to change back housing of my phone all on my own.

So after I disassembled phone I was going on to put everything together (camera silver ring, speaker and microphone mesh and headphone ring).

During the removal of headphone ring, that little silver ring fall apart and only thing that was left was little plastic thing that was holding that ring.

I thought it wasnt necessary so I didn't put it back in...

So after i assembled the phone volume buttons and power are very hard to press but they work, mute button can't be pushed at all and i don't have bar of Wi-Fi signal unless I am standing next to the router...

Thanks in advance.