Hey Nanhoo17,
the underline in the titles is part of the theme’s visual style, thus it is not changeable via the back-end settings. You can, of course, remove it by adding a line of extra CSS into the “Style: Add Custom CSS” tab of the Theme Options panel:
.page-title h2 a, .page-heading h1 a, .single .post-header h1 a, #blog-header h1 a, .post-header h1 a { border-bottom: none !important; }
Sincerely,
Andrii / Satori Studio