Is national insurance the name of a privatised insurance company in the US?
Cos here in the UK that's what they call the more regressive part of our tax system that's notionally earmarked for public health, state pension, unemployment benefit, etc...
Although lots of the replies to this are useful and informative, this seems like the kind of common and basic question where there should just be a resource we can signpost people to, with easy steps and answers to frequently- encountered issues, presented in an order and with language that supports but does not overwhelm interested parties...
I would go even further, by not voting the message those in power get from you is "the current situation/trajectory of society is fine with me". Whether or not that's what you intended.
Pergnat.