The steps to log in for the first time B2B or recover your user password would be:
1) Log in B2B
2) In I am already a customer section click on "Don't have a password yet"?
or " I forgot my password" - in case you have already set up a password but you do not rememeber.
3) Introduce you company tax number.
4) Click on "Send email" to via emil receive the pasword to get acces to B2B.