Instructions
Turn on your PSP using the "Power" button on the right side of the unit.
Use the directional pad to scroll through the list of options onscreen until you come to "Internet." Press "X" to launch the Internet and the Web browser will open onscreen. The XMB (XrossMediaBar) will be visible at the top of the browser.
Scroll through the options in the browser until you come to the "Digital Comics" icon. Press "X" to select it and the digital comics page will open.
Click on the "Catalog" tab at the top of the screen and then browse the selection of digital comics available for download.
Click the "Get It Now" tab beneath the title heading of the comic book and enter your payment info when prompted.
Confirm the purchase when prompted and the comic will download straight to your PSP and be available for reading in the main menu screen.