If you are an administrator, you can create new workspaces. To create a new workspace, first go to Settings.
Then, from the left-hand menu, underneath Workspaces, click on Create New Workspace. Then provide a Workspace Title, which will be the name of the central page of the workspace. Then provide a Workspace Name, which will be the location of the workspace in the workspace URL. You cannot choose a Workspace Name that is in use for an already existing workspace.
When you're happy with your choices of title and name, click Create and the new workspace will be created.