If you want to add a program icon at the tray zone enter these commands:
Start the program "Menu | File managers | puppyROX file manager"
Change to the directory /root
Click on the symbol "Show all files"
Right-click on the file .jwmrc-tray and select "Open As Text". The .jwmrc-tray file is opened with Geany text editor now.
If you want to add e.g. abiword, add the following line:
Save the file and quit Geany.
Restart JWM: "Menu | Shut Down | JWM restart"