I need a check list for my form but I need to limit it to 3 checks, I dont want to let the user add more then 3

I need a check list for my form but I need to limit it to 3 checks, I dont want to let the user add more then 3 

You can set a maximum or minimum number of checkboxes if you use the standard check box field (under Form Tools menu)

Please check the complete step by step instruction here:

https://www.jotform.com/help/251-How-to-set-up-minimum-or-maximum-number-of-selection-on-Checkbox-Field