Legacy loader issue Kali installation through USB

Hi, updated to el capitan yesterday ( on macbook air 14) and I and then decided to install Kali, and boy it's been one problem after another, so far nothing has gone the way it's supposed to. Without going too much into details, some of which include ( problems downloading Refind, booting the iso image onto USB and etc. I think I managed to do that.

So now I try to reboot my mac, after the refind page shows up I plug-in the usb and I get only one volume :( The Legacy OS one) and the guide for installing linux says try installing rEFInd and try again, but I already have refind.

I try to boot the legacy folder and it says:

Starting the Legacy Loader
Using Load Options USBAttachment 982 Attachment 982 Attachment 983 Attachment 982 Attachment 983
Error: Not Found while loading legacy loader

Make sure u have the latest firmware update installed
*Hit any key to continue*

Any help is appreciated :) I'm really getting exhausted trying to install Kali, first time though.

P.S. There is a very high probability I've messed up somewhere before, because as I said, I've been running into almost every problem out there, googling, and trying to go around it, most of the time not even sure what I am doing, so... I may have messed smth up on the way.
I hope you can see the pictures