There are two types of accounts:
Personal. It's for the ones who don't have any legal entity.
Company. Created for a legal entity. It contains extra fields to fill.
To switch a type of the account you have to click the settings button in the top right corner of the dashboard.
Then choose the needed account type and click the "Save" button
For the company the extra fields are:
Company name (necessary);
Company address (necessary);
Company site (necessary);
VAT (value added tax);
Additional info (any helpful info you'd love to add).