Circle to square images?

Alright, so this has been bugging me for a million years. I've googled and forum searched but I just can't find anything! (Maybe i'm just bad at finding things..) I put a picture, and it changes to a circle image! I chose a template when I first joined, so I figure thats my issue, although I like my template. Anything I can post in Javascript or CSS sheet to change this? 

Widgets are circle images  (ugh) 

And then my real affiliates as well! 

Please help me with this! It shows up like this in posts as well! It really bothers me! I used this to add my affiliates down to the bottom of my page: https://help.forumotion.com/t135528-add-affiliates-to-the-bottom-of-your-homepage

I would appreciate links to this topic, or if you know what to do! I found one of square to circle, but that wouldn't help much..

Forum: http://CanisKingdom.forumotion.com

Hi,

Go to Admin Panel -> Display -> Colors -> CSS Stylesheet

Search for:

Code:

img {
border-radius: 15px; 
}

Replace it with this:

Code:

img {
border-radius: 0px;
}

Thank you so much! Worked like a charm!