Kab has two basic views, Business Card and Editing. You can switch between them with the View menu.
This view lets you see what information has been stored for each entry you have added to Kab
To select a particular entry you can use the Drop Down box in the Toolbar, or you can step through the entries using the large arrows on the Toolbar or with your keyboard up and down arrow keys.
At the top of the main card area you can see the name as it appears in the Toolbar Drop Down box list, and an important date such as the person's Birthday.
An address will be shown in the middle of the card. Kab lets you enter more than one address, for - say - Home, Work and Holiday Dacha. The Drop Down box above the address then lets you select which of these is displayed.
The bottom of the card shows email addresses, URLs and telephone numbers. Left click on the email address to send an email, on the URL to open a browser window. If you have entered more than one email address or URL, then only one will be displayed on the card followed by [..] and when you click on it a little dialog box will appear so that you can choose the address you want.