Let's begin the process of installing Kali:
- Click on New in the upper left-hand corner of the screen:

Main VirtualBox screen
- Name your virtual machine Kali Linux, select type as Linux, and select the version as Linux 2.6 / 3.x / 4.x (64-bit). Press the Continue button when complete:

Name and operating system selection screen
- Memory size: You will be presented with a slider for memory size, with the ability to manually enter a value: in the box type in 4096. The 4 GB of memory will provide a smooth and responsive Kali install. ...