***GOT IT***
For the people who want to change/add a widget title manually (and the Widget Sidebar doens’t give them this option):
1. Look in the widget php-file for the following code:
echo $before_widget . $before_title . $options[‘title’] . $after_title; ?>
This is the php-code that makes the title of your widget show up.
2. Insert the following code (the bold one):
echo $before_widget . $before_title . $options[‘title’] = “WRITE YOUR WIDGET TITLE HERE” . $after_title; ?>
3. Change the frase WRITE YOUR WIDGET TITLE HERE into the widget title you want to show up and save the document
4. Replace the old widget php by the new customized one and be happy that you didn’t have to search halve a week for an answer;)))
Needless to say that in most cases the Widget itself gives the user the option to change the title in the Presentation > Sidebar Widgets menu.