You can easily change the name and the URL of your Space.
In Admin mode, you will see a 'Menu' button in the top left corner:
Please choose the Space Settings cell to change the Space's name and URL.
After that, you will see the pop-up screen with settings.
Now you can change the Space's name and URL.
The Space name will be displayed in the title of the page, inside the Space, and on the login form.
The Space id is a unique identifier for your Space. Please note, that the Space under your name may already exist.
After you make the changes click the OK button.