Anybody knows if I can change a content in META or LOG IN?
To be exact: i want to leave only "log in", the rest I want to remove: "entries RRS", etc.

Thank you,
Daiva

Are you talking about META tags or the META Widget?
The Widget is a WordPress item and you need to edit the code in wp-includes/default-widgets.php to change that or you could use a different plugin like http://wordpress.org/extend/plugins/sidebar-login/