How to active payment pane in Commerce Kickstart?
I think you are looking for Commerce Checkout Pane Payment or Commerce Checkout Pages. 

Commerce Checkout Pane Payment Module Feature:


This module creates a Checkout Pane that shows the selected payment method on the review page of the checkout. This is a contrib module for Drupal Commerce.
Drupal Commerce Contrib. This module creates a Checkout Pane that shows the selected payment method on the review page of the checkout.

Commerce Checkout Pages Module Feature:


Commerce Checkout Paages gives site administrators the ability to create additional pages for the checkout process through the admin user interface.