Three boxes

Hello, i think im in the right thread here, i apologize if im not.

I am trying to get the three boxes with white frames and a hoover button to work on my page, i have tried to go through theme settings, but all i can get is one picture and in a vertical line, not horizontal and nowhere to find where to fill in the name of the button.

I have struggled a few days now, and english is not my first language so sorry it im a bit hard to understand. I would love some help and guide to take me trough the steps to get the three images with buttons to my page.

Thank you so much for your patience, best Minna from Sweden