How to change type of an account?

If you want to change a type of your account, you may do it directly from your account.
First of all, log into your account and then go to Settings > Account settings.
It moves you to “Your account” section, where you are able to see what kind of the account you already have (Free, Basic, Professional, Enterprise).

Below this information, there is a blue button that regards to the payment. On the same verse on the right side there is a grey button with “Change account type” name on it.
Click on this grey button and choose one of type of an account that responds to your business needs. After that you will be moved to payment section.