You are able to log into distinctive Darknet marketplaces only with an alternative links, it means the following : upcoming customers and vendors don’t have a possibility register until they will get an URL from an previously registered customer.
You can find those at http://deeponionmarkets.com/, it posts updated URLs to concerning Dark Web markets. You shall follow these URLs to get access to the sites.
In case that there are some troubles with an access,for example, links won’t work, you should lie in wait and check for Dark Web marketplaces link. Carry on, because some of the markets shut down and let registrations from time to time, due to server load.