Worship time can be described using different terms. Some parishes call it "mass" while others may say "liturgy" or "service". You can set the term your parish uses to display in the program.
On the File menu, click Setup > Mass Labels. The default option is Mass, but you can select another term or enter a custom name. The term you select or enter displays in various locations in the program, including the button and related windows on the Information tab, as well as the button and report sections on the Reports tab.