Hi,
I really don't think that your problem is the same than "meet_amith" who create this topic.
1/ You didn't provide useful information, like : your website url, your HikaShop version.
2/ I don't understand clearly you problem
but when i edit an payment method during test an order process, then the payment methods are shown, but no button to process the order.
I am sorry but it does not have any sense.
3/ Please provide a screenshot of your checkout workflow and a screenshot of your problem, if you can't formalized it with works, a picture will help us to help you.
Regards,