This is a simple problem.
Your button list code looks like this
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auf euwiki suchen,http://euwiki.net,favicon
auf euzine suchen,http://euzine.eu,favicon
mailen,mailto:?subject=euwiki.net - Das EU-Wissen&body=%s - http://euwiki.net/,http://mail.google.com/favicon.ico
drucken,http://www.printfriendly.com/print?url=http://euwiki.net/,http://www.printfriendly.com/images/printfriendly.ico
Here, each line is the button's information.
Each line has three params separated by "," (comma). The first parameter is the Button name, 2nd is the URL, 3rd is the Icon URL
In your case, i didn't see the button used twice.
For your second question, a wordpress search engine will usually look like
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http://www.example.com/?s=searchTerm
In this plugin, the "searchTerm" will be replaced with the selected text of your blog. So you should use %s in that place like
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http://www.example.com/?s=%s
You should use this URL as the second parameter for a button (mentioned above)
If you want to search using Google, then use
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http://google.com/search?q=%s
Use this concept to build your own buttons. Please see the documentation for more info