Click the add button in the bottom left side of the extension to add a two-factor code, which will bring up the Add Two Factor Code dialog box.
ACCOUNT NAME: Type the name of the account associated with the two factor code, such as Google, Facebook, Reddit, etc in the first text input box
USERNAME: Type the username of the account associated with the two-factor code, which is often the e-mail address associated with the account. Example: firstname.lastname@example.org
INPUT KEY or PASTE QR IMAGE: Type or copy-and-paste the text key code given to you by the account service providing you the two-factor code information. Often a long string of letters and numbers (see examples below). 2! Authenticator will try to properly decode a variety of key formats, however, some service’s key codes may not be compatible. You may also copy-and-paste a QR code image into this field to pre-fill all entries. (See Copy and Paste)
Example code formats you may see:
XX4X XXXX XXXX X3XX XXXX XXXX XXXX 9XXX
XX5X XXXX XXXX X2XX