remove the lines from default.php, full.php(you did), home.php(homepage) and view.php(single page template) and you should be good.

OK, I'll try, thanks.

But why should this be removed from all those pages? Isn't there an only place to change? How does concrete5 use these files?

thanks
Lore

Well all of those page-types are being used.

If you wanted to re-arrange your theme, you could go on the model of the standard default theme. What I mean is you could place that sign in link in the elements/footer.php modeled after the way it is done in the default theeme.

Open up that folder under concrete/themes/default/elements/footer.php You will see the sign in link is placed there. Emulate this with the green salad theme and you should be good to go.

For the green-salad theme it is still placed at the bottom of every page and not in the elements/footer.php.

edit: This will allow you to edit it in one place no matter how many page types you use. Sorry didn't include the point in the original post.