If you have received an email simiilar to that shown below a colleague has shared a report with you on Brand View.

Report sharing allows you to work collabaratively with colleagues on the same report, ensuring everyone in the team is looking at the same data. 

To view the report click on the link as indicated above, where you will be prompted to login to your Brand View account (if you are not already logged in). 

To open a shared report go to Open  and select the shared report that will now be included among the list of your saved reports. Then simply click on the report name from the list.

You will see the following notification that someone has shared a report with you, along with a message from them if they have chosen to include one.