Insula on "[w3 total cache +gzip] error 500"

hello,

I have big problem with setting up Gzip and Cache properly I tried many codes and one even broke my webpage for 2 hours.
here is my page adres
http://mademyway.pl/
I am currently using Htaccess editor plugin to edit file.

# 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

and because I did not enable gzip i can not set up cache