It is a very basic teleprompter app. The text moves quite fast and the only way to slow it down is NOT by sliding it slower like it should, it is to make the text bigger.

By making the text bigger it accentuates your eye movements which is counterintuitive to one of the big reasons for using a teleprompter. So they should just make a lower speed instead. Even at 0.5 it is too fast for effective pauses and inflection, depending on your content.

Also, be VERY careful when you are setting up your account. You have one chance to select the scripts related to your industry. You get those scripts and only those scripts and there are no ways to change your mind later.