Trying to get Kali Linux to work with virtualbox

Hello,

I'm trying for the first time to download Kali and use it with virtual box. I've watched a few YouTube tutorials on what to do, but I'm not able to find the .iso like they are.
I download the 64 bit installer, and then I go into my virtual box software and when I'm prompted by the YouTube video to press the blue disc to load in the .iso i can't find it in anywhere in my download
of the Kali Linux 64-bit (installer)

https://forums.kali.org/image/png;ba...BJRU5ErkJggg==

in the YouTube video it shows this above.

I'm obviously doing something wrong here because i cant find what they are loading in the file that i downloaded.

Any help would be greatly appreciated and thank you in advance
Cybin