For now only One-Time Passwords (TOTP and HOTP) are supported.
For a list of websites supporting OTP have a look at dongleauth.com.
Entries are divided into two categories: unprotected (shown as an open lock) and protected (shown as a closed lock). Unprotected entries can be accessed directly. Protected entries can only be accessed with the PIN.
You can choose to create a protected entry by checking the “Protect with PIN” box when adding a new entry.
You also have the option to require user presence in the form of a required touch on the Nitrokey 3 to access the entry by checking the “Require User Presence” box.