A) Go to  Woocommerce-> Settings -> RAE setting-> Enable “EnableExchangeRequest.” -> After that you have to select Maximumnumber of Days.If value is 0 or blank then Exchange button will not visible at order detail page. And Select the orderstatus in which the order can be Refunded.

Do the same process for showing exchange button.

Go to Plugin's  refund setting->go to select order statuses which the order can be refunded setting -> select order statuses from the drop down at which you want to show refund button and do the same process for showing exchange button.