Hi, I am new to drupal commerce. I had been installed commerce_coupon and commerce_discount module. I would like to change the layout of Checkout page. How to apply and remove the coupon code in shopping cart content instead of do the both actions in the pane?

I was searching the Google but still can't find the answer. I was thinking to use hook_form_alter but is that the true method?

Thanks for any help on this.