Why can i (removed by moderator - please keep it polite) not log in in the offline scratch?! I opened the offline version of scratch and it instantly created a new project, wich is fine. But i could not find a button to log in to scratch! Could anyone pls help me????

You could not log in to Scratch using the offline Scratch editor. You can only log in using the browser version. But you could still save your project from the offline editor then import it to online Scratch to share it normally.

To add to what #2 said, you can also work on projects on your account offline if you save them to your computer and load them onto the offline editor.