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Nick GarrisonNick Garrison 

Create a dashboard button missing

I am working on the Trailhead button for Dashboards and it is asking me to open a report and click on create a dashboard. But I don't see that option anywhere. 
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Nick,

As a current limitation of the feature after saving a dashboard in Lightning Experience, you can’t edit it in Salesforce Classic. Instead of editing a Salesforce Classic dashboard in Lightning Experience, consider cloning the dashboard and editing the clone. That way, you can still edit the original dashboard in Salesforce Classic.
The only workaround would be to recreate the dashboard in Salesforce Classic.

Please refer the below document for reference. Please mark it as best answer if the information is informative.

Best Regards
Rahul Kumar