how to select button in cypress test code example

Example 1: cypress click

cy.get('.btn').click()          // Click on button
cy.focused().click()            // Click on el with focus
cy.contains('Welcome').click()  // Click on first el containing 'Welcome'
//https://docs.cypress.io/api/commands/click.html

Example 2: cypress multiple true

cy.get('whatever').type('Test all the things', { multiple: true });