Go to www.clarus.biz  and click on log in at the top right. 

You first create a Workspace. Then you enter your first name, surname and e-mail address. You also choose a password. 

This is your general account. In the next step you have to fill in some extra details. These are: The name, the name of the company, possibly the commercial name, the address, email address, telephone and website (optional).