It usually happens during the summer of the election year, sometime before the party's national convention.
The House selects the president out of the top 3 candidate with votes.
This is done by the nominees and a committee of advisers. The factors that are important is the personal and political history of a canadate, and the state he/she is from.
A candidate that is running for President receives their nomination at their party's convention. This is a meeting that is held to announce the results of an election.
The citizens/ the people
Congress.
The President selects his own running mate.
4 years
he or she selects an exploratory committee
he or she selects an exploratory committee
he or she selects an exploratory committee
the legislative branch selects the head of government
The party of each candidate selects a slate of state electors. It is these people we actually vote for when we cast a ballot for president, not the candidate. The slate with the most votes gets to cast electoral votes for the President. Although each elector is sworn to vote for a specific candidate, there is no control on how they can vote and occasionally there is a "faithless" elector who crosses his party either by mistake or on purpose.