Hi Xeinar,
To hide the Featured Slider Navigation, Please go to ‘Appearance > Customize > Additional CSS’ and paste the below Custom CSS code.
.featured-slider .owl-nav {
display: none;
}
.featured-slider .post-slider-header {
padding-right: 0;
}
Skipping the posts on Sliders/scripts are not possible through providing Custom CSS code. You really need to customize the Theme Code and make sure you make a Child Theme first before customizing the Theme code so that your customized code won’t get lost when updating the Theme to a Newer Version in future.
Instead of Skipping code through custom Code, you can create a new Category where you can assign the desired posts to it.
Thanks