Brand Analytics permissions are located on the global permissions section. Please follow these steps:
a. On the Seller Central home page hover over the Settings tab on the top right, click User Permissions.
b. Select Manage Global Permissions next to our user name - Sellers Arena
c. Next, under Performance, select View on Brand Benefit Eligibility
d. Under Reports, select View on Brand Analytics
e. Scroll to the bottom and Click Save Changes