NGINX.conf access

Hi. am I able to access my nginx.conf file. I need to add the below entries for browser caching:

location ~* .(txt|xml|js)$ {

expires 8d;

}

location ~* .(css)$ {

expires 8d;

}

location ~* .(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav|mp4|m4v|ogg|webm|aac|eot|ttf|otf|woff|svg)$ {

expires 8d;

}

location ~* .(jpg|jpeg|png|gif|swf|webp)$ {

expires 8d;

}