If the following message be displayed within Salesforce, it indicates that the Salesforce User who is trying to access the Business Intelligence application has not been granted access via it's "Configuration" user interface by your Salesforce System Administrator:

In order to resolve this issue, please ask your Salesforce System Administrator to enable the effected User via the "User Licensing" tab within the applications "Configuration":

Business Intelligence > Configuration > User Licensing

Once the Salesforce User has been enabled and the configuration saved the above messaging will no longer be displayed.