To add a comic to your comics page, first locate the comic within the app, then tap the sharing icon in the very lower left corner of the screen. Then tap "Add to My Comics."
To remove a comic from your comics page, tap the main menu button in the very upper left area of the screen. Then, click My Comics. Tap on the comic you wish to remove. Once the comic loads, click the sharing icon in the very lower left corner of the screen. Then click "Remove from My Comics."