Change navigation arrows

[Josan1965]

Hi. My english is very limited, sorry.
It's a newbie question. I only know some html and css. I bought Swipper Studio. I want to change the navigation arrows. I've seen that they are fonts.ttf, but I can't access the arrows directly in the html, I assume they are placed with some javascript trick (how daring is ignorance).
I have managed to give a border to the container div and add an svg, but I am not able to remove the default arrow.