You are allowed to enter at distinctive Deepweb marketplaces with the only help of URL, this determines next : inpending customers and merchants can't register before they will receive an URLs from an already enlisted vendor or buyer.
You can find those at https://darkwebonion.com/, it possesses fresh links to concerning Deepweb marketplaces. You shall follow these URLs in order to get access to the sites.
If there are some problems with an access (links don't work), you ought to wait and check for Deepweb markets alternative link. Keep trying, as long as few markets may stop and open registrations frequently, depending on server load.