I care enough about politics to know who I'm voting for but not enough to go out and campaign for the party I'm voting for, are people that are members of a par

I care enough about politics to know who I'm voting for but not enough to go out and campaign for the party I'm voting for, are people that are members of a party the people that put up signs in their windows and the like? What is a "member" of the conservative party? Does someone just sign some paper or do they pay money to support the party, or commit to helping campaign?