Secure connection failed

The problem is that I did that once already per reading someone else's post. But I am still getting pop ups. Now there is no program name to be found for me to delete or anything in any of the places I've been told to look.

Good evening guys. I tried all the stuff on those links for removing popups to no avail. I have made some discoveries, however. I'm hoping to attach a couple of shots that show what I'm seeing. I think I may have something called "Aztec Media". I tried searching this and only discovered that it's bad, but I could only find ways to remove it from PCs. So, the other day, seemingly randomly, I went to search for something and instead of my usual google search engine, Yahoo opened up. I've never used Yahoo for my search engine. I went into my system preferences to check it, and it was set to be Google, however, yahoo was still the one coming up. Then today I happened to that if I searched with this "yahoo" search engine, it would show as Aztec Media Yahoo Search Results. I didn't figure that was right, so here I am. I also was trying to follow some of the hyperlinks on one of the pages you directed me to and it sent something to my downloads. I opened the drop down and stopped the unknown download. It's called "amc_rb_mrtmac.pkg.download". It's telling my that it was created January 24, 1984 at 3:00 AM. Modified at the same time. I have no idea what it is or where it came from, but I noticed that there was a second one that appears to have downloaded all the way. It's not anything that I have particularly opened, but it's there in the dropdown list. Is this potentially part or all of my problem? How do I get rid of it. Everything that I'm seeing looks like older lists. Is this something newer that doesn't have as much information on it yet? I just want to get my internet back to normal! Please help me if you can! Thanks. Kathi

It would appear that this Malwarebytes Anti-Malware for Mac did the trick!! Thank you so much. I'm hoping it really did take care of the whole problem. My browser was back to Google again! That's a good sign. It did find and remove some malware. Thank you again for you help!