The answer to 'how to kill tick' is to use a tick control product containing an insecticide like permethrin or pyrethrin. Apply the product to areas where ticks are found, such as tall grass, shrubs, and leaf litter. Follow the product instructions carefully and reapply as directed, typically every 2-4 weeks during tick season.
For severe tick infestations or if you have concerns about using insecticides, it's best to call a professional pest control technician. They can assess the situation and recommend the safest and most effective treatment options for your home and yard.