Resize featured images

Hi, I'm using Catch Resposive free. Is it possible to resize the fatured images? The current size is 200px x 200px. I would like a rectangular format, around 350px by 200px. http://tot.eng.br/ http://i1223.photobucket.com/albums/dd516/diegostf/Sem%20tiacutetulo.png~original Tks.