Program settings (also known as Preferences) are available in three locations:

Program settings are divided into two sections. Click Settings in the menu panel to access settings, as shown here.

You will note that General is highlighted in blue, indicating it is the selected settings group. Available settings are:

The My Account tab has three variations. The first variation is for Free users. This screen allows you to start a Premium Trial, enter a Premium License, or purchase a Premium license. You will only be able to start a Premium Trial if one is available to you.

The second variation is for Trial users. It offers the opportunity for the user to purchase a license, to enter a license that they have already purchased, or to deactivate the Trial. If you deactivate your trial, you will no longer be able to use Real-Time Protection, and you will not be able to resume the Trial at a later time.

If you are using the Premium version of Malwarebytes, a slightly different screen is shown. This version takes into account that you have already purchased a license and will display your license key, should you require it. The three buttons at the bottom are replaced with the Change License Key button, and the Deactivate License button. The screen is shown here.