Need to change featured slider image size in wordpress

i need to change the size of featured images on my aviation classifieds website. I am a pilot and i dont know coding stuff. I saw other threads on stackoverflow and I tried to go to media settings in wordpress backend but that did not change the size of images on the featured slider.

Can somebody tell me exactly how can i do it programmatically. Which file and what type of code should i use.

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  1. First Login using http://www.flightravelgear.com/wp-admin

    Then go to Appearance and then to the theme editor

    After that you will see file named as style.css.Find image_class over there and add width and height to that.

    .image_class {
    width: 100px; //give your image width
    height: 80px; //give your image height
    }
    

    Add

    .featured-three {
    left: 10px;
    }
    

    Answer for latest question

    Add another this line of code below image _class

    #slider{
    height:210px !important;
    }