Hi vivek7092,
It will really depend on the theme you are using. If that is built into the theme, you can make a Child Theme and then remove it from either the template files or use a CSS rule (display:none or visibility:hidden). Display: none will hide the element and it will not take up any space. Visibility: hidden will hide the element but it will still take up space on your site.
For example, if that is in a div named rss_icon you could add one of these rules to your Child Theme’s style sheet:
#rss_icon {
display: none
}
#rss_icon {
visibility: hidden
}
Hope this helps!