You can create a new drill by selecting new from the Drill menu. You can also edit any plain text drills by selecting a drill and then selecting Edit from the Drill menu. Encrypted drills, which are the progressive drills for QWERTY and Dvorak from Drill 7 and up are not editable.

Two display sizes of 12 and 24 point give you and approximate idea of how the drill will look. The Drill Editor opens using the size set in the Preferences.
You can set the speed goal for the drill. If you set a speed goal for a drill, the pupil cannot set their own speed goal.
Use the Key Vocabulary tab to restrict what letters can be entered in the the Drill Text field. If you have no key vocabulary or new keys, the Drill Text field will not have any restrictions. The key vocabulary will also show these keys darkened at the introduction of the drill. You can add return to the vocabulary by typing the return key in this field. It will show as a paragraph symbol.
New Keys are considered part of the key vocabulary and will display the keys blinking at the introduction of the drill.
You can also copy text from another source and paste it into the Drill Text field. With a normal paste, the key vocabulary will not be enforced. If you select Paste Using Vocab from the Edit menu, it will only paste words that contain all of the key vocabulary. It will also filter curly quotes to straight, adjust returns and give double spaces between sentences. It's best to have double-spaces in the drill even if you've selected to not use double-spaces in the preferences. This way Master Key will remove the double spaces but leave them in if you have double-spaces on.

In the Tip field, enter any typing tip you like. You can use returns to separate paragraphs. This tip will be presented in a window at the introduction of the drill.
Once you are satisfied with your drill, you can save it to the Drills folder or a Drills subfolder that you created. Then close the Drill Editor and give it a try.