The Print Envelopes feature works the same as same feature in the main part of the AnyBook program.  It is reached by selecting FILE >> PRINT ENVELOPE.

In order to use this portion of the program, you need to have a labeling program installed on your computer which allows you to create and print labels and envelopes.  A word processing program (such as Microsoft Word) is recommended as your labeling program since you can use macros to automate the process.

Complete details on how to use this feature is found in the help documentation in the main part of AnyBook.  Select HELP >> SEARCH HELP and look for: "Envelopes, Printing."