how to make an image fit into a set size

Hello, im trying to make an imge fit into a custom size in all of my "image" section using the muffing builder, for example I have a 1000x500px image that I need to fit (without streaching, just center) into a 500x500px space, I tried this: http://guanabarna.com/wp-content/uploads/2017/05/Captura-de-pantalla-2017-05-25-a-las-2.16.23-PM.png  but it didnt worked... 


could you please help?

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