RSS feed / icon – reinstate

where is the optional RSS feed icon?

Last year I got rid of it and I can’t remember how i did. Now i want to reinstate it on my website – up on header beside the search bar, youtube and google tabs. (i put in a temporary widget one in the footer)

How do I do that? where is it? I have looked in Theme options and can find nothing. https://www.joanwalsh.ie/

thanks, joan