You can print the custom letter you are currently working on by clicking the Print button (printer icon) at the top of the window.
You may also preview the letter before printing it by clicking the Preview button (magnifying glass) at the top of the window.
Opening an Existing Letter to Print
In the top horizontal tool bar, click on Tools, then select Letter Writer from the drop down menu.
In the Letter Writer window, click on File, then Open. Select the letter you want to print.