To change your workspace name and URL, go to Workspace General Settings. To change the Display Name (the name that appears in the Workspaces drop-down menu) of the workspace, simply type your new name into the Name field, scroll down, and click Update.
To change the URL of your workspace, go to the URL field and click Change URL, and type in your desired URL in the lightbox that appears.
Note: Changing the URL of your Workspace will impact any direct links you have bookmarked or saved in the space.