Turn off YouTube arrow under links

this is the style rule that has the red border

.youtube {
    background-image: url(images/youtube.png);
}

you can replacing it in your child theme with
/*media all*/

.youtube {
    background-image: none !important;
}

Thanks, but where do I insert or modify this code? I looked in Style Editor for Pinboard, but youtube is not listed.

in your style.css file

Thanks for that, however, I am not a programmer. When I go to editor (editor-style.css), I looked for “youtube” and do not find it. So, can I accomplish removal of the red arrows by pasting:

/*media all*/
.youtube {
background-image: none !important;
}

… somewhere on that page? I don’t have a child theme & don’t know how to create one. Thanks again.