Put the following stuff into your monobook.js:
includePage('User:Flominator/flos functions.js'); document.addEventListener("DOMContentLoaded", function() {
insert_link_before("li", "pt-mycontris", '<a href="http://tools.wikimedia.de/~magnus/mynoinfo.php?user=Flominator">Info-Tag</a>'); show_infobox(); }, false);
done. then, how does it work?