On the lower right corner of the Timeview Results tab, there's a link labeled Add to Dashboard (purple arrow).
Clicking on that link will bring up this modal:
Select the desired dashboard from the dropdown list, then click Submit. You may also create a new dashboard and add the report to it.
After you hit Submit, you will see a green notification bar informing you that the multitimeview dashlet has been added to the dashboard.
Once the multi-timeview dashlet is added to a dashboard, you will need to reapply the dates and time grains using the edit options for the dashlet. Here's a video that shows you how to do that.