My site is http://www.canhamohousehemp.com and when I am finalizing an order , does not appear the option to select the shipping method , or payment method .
Are You using sef404sh component? Yesterday I had a user with same issue and it was becuase of a wrong link created. So if You do please disable it and check to be sure it's not the same problem.
Well, apparently, I've been tinkering and managed to get the shipping methods and payment appears. But still the problem of not being able to set the shipment by the carrier, that is, depending on the weight of the shipment at a price. Can you help me with that? This part does not even know and I'm lost.
I'm afraid I do not know how to make it either. You will have to ask VM developers for help here. I think You will need some extra plugin for such functionality, but I'm not a VM expert.