Letters are printed from the Inspection Screen. If there are no violations for the inspection you are viewing then the [ Letter ] button, at the bottom of the screen, is not active.

Click the [ Letter ] button and you will have the letter selection screen:

The default Letter for each category is preselected in the Default Letters of the Administrative Functions of the program. You can override this selection by clicking the [ .. ] buttons and finding a different letter.

Just How the letter prints and is saved is set up under Printing Preferences.