I tested the rule in my own configuration and it's working.
All mail is routed through procmail by default so there is nothing to enable.
The delivery path is setup for IMAP which is different than POP so make sure that is what you want.
I am not sure how you modified the file but if you modified it on a Window PC and then uploaded the file you will need to either ssh into you account and run `dos2unix /etc/procmailrc` or use a text editor that uses the correct line feeds.
You can also look at the log in /var/log/procmail to see if there are any errors.