PS5 has a disc insertion slot on the entire surface of the main unit.
There are two ways to eject a disc: by pressing a button on the main unit or by using the screen controls on the main unit.
Since you may not know how to operate PS5 for the first time, we will briefly summarize the two methods.
Ejecting a disc using the buttons on the main unit
To eject a disc from PS5, press the black button on the front panel.
If you are placing the PS5 vertically, press the top button; if you are placing it horizontally, press the button near the center.
The other button is the power button.
It is a little confusing because the body is black and the buttons are also black.
Ejecting a disk from the screen UI
You can also eject a disc from the screen controls.
With the software you want to eject selected on the home screen, press the Options button and select "Eject Disc" at the bottom of the screen.
The Options button is the small button in the upper right corner of the DualSense controller. (The three horizontal lines are on top.)