Read this documentation to prepare your environment https://powerbi.microsoft.com/en-us/documentation/powerbi-developer-using-embed-token/

To see embedded report, dashboard and tile, you need to fill missing details in web.config.

clientId - Id of AAD application registered as native app.

groupId - group or workspace Id in Power BI which contains reports, dashboards and tiles you want to embed.

pbiUsername - Power BI username (e.g. Email). Must be an admin of the group above.

pbiPassword - password of Power BI user above.

For security reasons, in real application, don't save the user and password in web.config. Consider using KeyVault

Please follow these steps to run PowerBI.com Integrate samples:

You need to register an application in https://dev.powerbi.com/apps

Redirect URL - http://localhost:13526/Redirect

Home Page URL - http://localhost:13526/

Redirect URL - http://localhost:13526/

Home Page URL - http://localhost:13526/

Redirect URL - http://localhost:13526/

Home Page URL - http://localhost:13526/

Registration Example:

Copy Client Id and Client secret to web.config file