Need to change featured slider image size in wordpress

Question

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.

Answer 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;
}