Where do I find the junk filter button and how do I turn it on ?? I've tried to find it so I can get a junk rating when I am doing a search but have had no luck in getting the search results to show a junk rating beside them

There is no specific rating. You're the one configurating the Junk Filter by using the Junk Filter button for files you know/believe to be Junk. Those files will show up with a Trash Can icon instead with Stars.
See Screenshot.

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"

The junk filter is useless. I have done this before just to find that I wasn't getting any search results. Ended up that I made it so that the junk wasn't displayed. Way too many people are hanging on to viruses and other garbage thats why they spread people!