Click "New Terminal" button from the left side menu
When a terminal window opens, copy below content, right click inside the terminal and paste. (Make sure to hit Enter key inside the terminal window once before closing window)
/ip firewall address-list
add address=8.8.8.8 list=GOOGLE_DNS
add address=8.8.4.4 list=GOOGLE_DNS
/ip firewall filter
add action=drop chain=forward dst-address-list=GOOGLE_DNS place-before=0
For Mac users
Winbox tool is not available for Mac users. Mac users could either login to router via web or SSH into the device and perform step 3 above.
