When you first sign up you will have the option to assign that course to yourself immediately (best for individual users), to assign it to other users (best for company users - you can still assign it to yourself), or to wait until later to decide.
The first option sets up an individual user account. The second two options set up a business user account with more features.
Buying more course licences
You can buy more licences for a particular course by clicking on Buy more licences when you are in the Manage drivers and courses page or when you are viewing a course.
Choose the number of licences you need, click Continue, then follow the prompts to make payment. Once you have paid, the course(s) will be available in your account.