There are two ways to rename a dashboard.

1) At the main Portal. You can click on the XwcktwCfMfWBDCIUG1lvLuuARPrwbElD8A.png showing on the lower right of your dashboard card, to bring out the "info" button. You can rename at the popup "Properties Page".


2) Within a Dashboard, you can go ahead and click the Name on the upper left. Select "Properties" and edit the name of the popup "Properties Page".


Here is the Properties Page: