Remove underlines from links

I have trouble removing the underlines from my links

what have you tried so far?

the underline is set in style.css of your theme:

.entry-content a {
  border-bottom: solid 2px #111;
}

please consider to use a child theme or custom CSS plugin to overwrite this CSS.

simply use a ‘custom CSS’ plugin; https://ww.wp.xz.cn/plugins/search.php?q=custom+css

.entry-content a {
  border-bottom: none;
}