To make changes to the Octane render settings, open the 3DS Max® Render Setup window.
Figure 1: Render Setup Button
For the most part, you can leave the settings at default. For beginners, you should pay special attention to some settings in the Kernel and Devices Tabs. Specifically:
Kernel Tab
Devices Tab
Figure 2: Render Setup Window
Figure 3: Render Width and Height
Figure 4: Max. samples
Figure 5: Active Devices