Both private customers and companies can be easily set up through your menu.
Click the menu key (3 lines) in order to open the menu. From here, you can choose what kind of customer you would like to create.
Fill in the appropriate information (required fields are marked with an asterisk). Once completed, click the 'tick' button at the top of the screen in order to save your customer.
Clicking into the customer will give you the ability to edit any details as need be using the pencil icon.