If you want to disable register_globals then your .htaccess file should contain the following line:
Here is how to enable register_globals via .htaccess:
1. Create an .htaccess in your virtual host's root directory
2. put the following code in it:
# Override PHP settings. The first IfModule is
# for Apache 1.3, the second for Apache 2.
<IfModule mod_php4.c>
php_value register_globals 1
</IfModule>
<IfModule sapi_apache2.c>
php_value register_globals 1
</IfModule>
php_flag register_globals 1
3. Save the settings