Im not sure what you mean by 'invisible' nor what you mean about putting the css in the header template.
You should put the GALbox <div> tag in the header template and add optionally add the css to your additional css definitions box in your admincp.
No stats will display if there are no records to show. If you have links that are being tracked for stats but they are not showing - than most likely your throttle is set pretty low and the cron job is taking care of the stats.
Both of these are discussed in more detail in the readme. If you can - post a link as it is easier to see the problem you are having.
hths
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