failed to install an edited style

Hi

I wanted to edit the ACS with titles so as to list the in-text and bibliographic citation numbering with square brackets. I followed the steps at http://www.zotero.org/support/dev/creating_citation_styles. All the steps went well till installing the file; I tried opening it in firefox, updated the word add ons and restarted firefox, but I couldn't find the created format in Zotero. I also tried to add it from the prefs list, but I couldn't find the file where I saved it to open it.
PS I saved it as a plain text file in .csl format. I'm using office 2003 and Zotero 2.1

Please help
Thanks
Rabab
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