Secretaries of State in each state must determine if candidates are qualified to be on the ballot. The three requirements for the office of President are:

1. Must be 35 years old.
2. Must be native-born.
3. Can't have participated in an insurrection.

You can sign a petition for your Secretary of State here:

Sign your petition

Many of these petitions have almost enough signatures to meet their state's requirements, so yours can make a difference.