Open the web browser and visit 
McAfee.com/activate.Sign in to your McAfee Account.Enter 25 Digit Mcafee Product key to Activate it.
Visit Support.brother.com and enter your printer Model to download 
Brother Printer Drivers. Install it & Begin with your Printing.
My name is Paul william. I work as a Technical Specialist at 
mywifiext. I will be glad to help you out with any sort of information related to any technical difficulty.