Hello,

Yes, you are right

1. Find the code: http://prntscr.com/lsdb18

2. Insert it into the Theme Settings > Custom CSS > Global

body .woodmart-my-account-links .orders-link a:before {
    content: "\f069";
    font-family: FontAwesome;
}

3. Change content and font-family, add body before the selector

Best Regards