How can I change the name of my project whithout making a copy ("save as") of it?
Hello and welcome to the forums! 
To change the title of your project without making a copy of it you need to export the project to your computer and then open the file with a text editor (like Notepad, for example). Then you need to edit the part that says "<project name: ~currentprojectname~ >. I hope this helps!
If you load the "Getters and setters..." library, you can directly set the project title.
thank you both :]