Hostinger.fr上的URL重写

I ask your help because I would like to do soms URL rewritting. Here is the htacess file I wrote for my site

    # Do not remove this line or mod_rewrite rules and search engine friendly URLs will stop working
    RewriteBase /

    Options +FollowSymlinks
    Options -Indexes

    php_flag display_errors off

    RewriteEngine on
    RewriteRule ^helper/?$ index.php?action=helper [NC,L]
    RewriteRule ^probabilite/?$ index.php?action=proba [NC,L]
    RewriteRule ^demon/?$ index.php?action=demon [NC,L]
    RewriteRule ^info/([[:digit:]]+)$ index.php?action=info&competence=$1 [NC,L,QSA]

The host I use is hostinger.fr but I don't know how to use the rewriteRules on it. (They said that it is activated and the first line (RewriteBase /) must be here)

Thanks for your help.