The FLDIGI team has published a new manual that is easier to read
and provides additional details on setup and configuration.
There is both a PDF file for download/print located here:
http://www.w1hkj.com/FldigiHelp-3.21/Fldigi_User_Manual.pdf
and also an online HTML version located here:
http://www.w1hkj.com/FldigiHelp-3.21/html/index.html
I was impressed with the changes and think that you will benefit
by taking a few minutes to look at them and bookmark them for future
reference.
73,
Frank
N3FRP