The first thing to do before placing a new order is to set up your favorite pools in NiceHash dashboard. You can do that by following navigation For buyers > My pools > Add new pool. Here you need to enter your pool settings.
The details of Algorithm, Stratum, and Port you can find at the pool FAQ at the very bottom of each pool page.
When filling the Username cell mind that it is the name of the worker that you have created at the pool, in other words, userID, not email. Fill Password cell with the password of your worker at the pool, usual that is X.
When you have entered the correct pool settings, you have to verify your settings with the pool verificator.
Once you have deposited Bitcoins to your NiceHash wallet and set up your pools,
you are ready to place your first order. You can do that by going to the Live Marketplace.