It's difficult to BROWSER CACHING

I don't know where to enter the code. It is difficult to understand English because I'm Korean. Could you set it up instead?

//credentials removed by staff

    Kasia Swiderska

    Hello intopilates,

    Please never post credentials to your site in posts. This posts are public and everyone can see that.
    To be safe please change password to your FTP now.

    If automatic enabling is not working it might be because you already have some entries in your .htaccess file.
    If you are not using this plugin anymore then please remove code it added and after WordPress entry

    # BEGIN WordPress
    <IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteBase /
    RewriteRule ^index\.php$ - [L]
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /index.php [L]
    </IfModule>
    
    # END WordPress

    add this code from Hummingbird

    <IfModule mod_expires.c>
    ExpiresActive On
    ExpiresDefault A0
    
    <FilesMatch "\.(txt|xml|js)$">
    ExpiresDefault A691200
    </FilesMatch>
    
    <FilesMatch "\.(css)$">
    ExpiresDefault A691200
    </FilesMatch>
    
    <FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav|mp4|m4v|ogg|webm|aac)$">
    ExpiresDefault A691200
    </FilesMatch>
    
    <FilesMatch "\.(jpg|jpeg|png|gif|swf|webp)$">
    ExpiresDefault A691200
    </FilesMatch>
    </IfModule>
    
    <IfModule mod_headers.c>
      <FilesMatch "\.(txt|xml|js)$">
       Header set Cache-Control "max-age=691200"
      </FilesMatch>
    
      <FilesMatch "\.(css)$">
       Header set Cache-Control "max-age=691200"
      </FilesMatch>
    
      <FilesMatch "\.(flv|ico|pdf|avi|mov|ppt|doc|mp3|wmv|wav|mp4|m4v|ogg|webm|aac)$">
       Header set Cache-Control "max-age=691200"
      </FilesMatch>
    
      <FilesMatch "\.(jpg|jpeg|png|gif|swf|webp)$">
       Header set Cache-Control "max-age=691200"
      </FilesMatch>
    </IfModule>

    This is how manual enabling works. You need to first change .htaccess file.

    Let me know how it goes.

    kind regards,
    Kasia