Editing PowerStore menu with CSS Menu Writer
The FAQ you mentioned is actually incorrect and only works with PowerStore 2. We will update this as soon as we can.
Once you've got PowerStore installed locally, with a correct local database connection, you should be able to open the Main.dwt.php Dreamweaver template, select the PHP icon that represents the menu, and choose Edit from the Properties Inspector to open CSS Menu Writer for making changes.
After making any changes, you will have to perform a quick fix to one of your menu files, so that it continues to work in PowerStore. This is detailed in this post here: showpost.php?p=42499&postcount=6