Clicking on My Account, By Now or navigating to any page which requires the user to login will redirect them to the login page.
From here you can Sign in to an existing account or register on the top right.
You will then be taken to the registration page. The user will need to input their name, email and password. If this is an organisation they will add a "Company" name, or leave blank if they are an organisation. A site administrator can create an organisation for them at a later date if they require this.
The system will create an account and send a confirmation email. Once confirmed the user will be able to login tot heir new account.