Hi there! I'm sorry to learn that you're having some trouble setting the data usage limits within the SmartFamily feature. Allow me to help as I know it is important to set data limits for some lines. Please click here https://www.verizonwireless.com/support/how-to-use-verizon-smart-family/ & you'll be able to refer to the "Usage limits" section under "Limit data usage / Remove data limit". Does this information help? If it does not, can you please explain what step(s) you're getting stuck on.
4Ken10011, I definitely understand your concern with setting the data usage limits. Data overages are never fun and will create a high bill. No worries, I will help get things sorted out for you. Check out the link below for more details about how to set up the limits. Scroll down the page to where it says usage limits for the instructions. Let us know if this helps.