The jEdit user guide, along with plugin documentation, can be viewed from the Help menu. If you would like to print the user guide, A PDF (Adobe Acrobat) version is available as an optional download from http://jedit.sourceforge.net/download.php.
If you would like to keep up-to-date in the world of jEdit, subscribe to one of the mailing lists. More information is available from the jEdit web site, located at http://jedit.sourceforge.net.
Now click the button labelled Finish below and have fun using jEdit!