While you can always use your device's clipboard to copy your passwords out of Codebook and paste them into other apps, Codebook offers several features for directly entering your passwords, depending on your platform.
Secret Agent is a helper application and global keyboard shortcut that you can use to insert your passwords in any app on your Mac or PC.
Learn how to enable and use Codebook's support for AutoFill Passwords in iOS. This feature requires iOS 12 or later. For earlier supported versions of iOS, see Find in Codebook.