Hello Edouard,
I would like to modify the link as you can see on the screenshot attached.
You can modify it from your /components/themes/wireframe/registration/default.progress.php and find the following code:
data-original-title="<?php echo JText::_( 'COM_EASYSOCIAL_REGISTRATIONS_SELECT_A_PROFILE' , true );?>"
data-content="<?php echo JText::_( 'COM_EASYSOCIAL_REGISTRATIONS_SELECT_A_PROFILE_DESC' , true );?>">
I would like to remove the detail under each profile
You can remove it by going to your backend > easysocial > themes > [select your current theme] > registration > Show user registered in Profile,
http://screen.stackideas.com/2015-06-08_1149.png .
Hope these help.