Upon start-up, you are presented with a screen like the one above. This is where you will enter the names that you want for your days and your periods. If your cycle consists of 5 days, you will most probably use Monday thru to Friday. For a two-week cycle, you could use 'W1- Monday' thru to 'W2 - Friday' for example.
The program will automatically increment the number of days and the number of periods as you start entering.
If you have accidentally entered too many days or periods, you may right click on either the days column or the periods column, where you will be given the option to delete the last day or period. Click anywhere else except on the pop-up menu to cancel this option.
An example of days and periods added in.