[Still Waters]

Hey guys, I'm stuck at step 1.

1)
httpd.conf needs editing to enable and configure mod_rewrite. Here's all the relevent bits from my httpd.conf. It can go anywhere between the <VirtualHost> & </VirtualHost> tags.
RewriteEngine on
RewriteRule ^/f([0-9]+)/s([^/]+?)$ /forumdisplay.php?forumid=$1&s=$2 [L]
RewriteRule ^/t([0-9]+)/s([^/]+?)\.html$ /showthread.php?threadid=$1&s=$2 [L]
RewriteRule ^/s([^/])+?/$ /index.php?s=$1 [L]

I put this into my root .htaccess file, and (right away) my site didn't work anymore (so I removed it again). What am I doing wrong? Thanks!