browser caching is not working properly

Im writing because i got a message that if by rechecking the status didn't work to get in contact with you guys. i'd like to know how can i fix it:

Browser Caching is not working properly:

- Your server may not have the "expires" module enabled (mod_expires for Apache, ngx_http_headers_module for NGINX)
- Another plugin may be interfering with the configuration
If re-checking and restarting does not resolve, please check with your host o