You can add your first personal question as soon as you’ve filled in a beep or test beep questionnaire. This way you have read the questions in the questionnaire at least once and the chance that you enter a question that is already in the questionnaire is smaller. When you’ve filled in 10 beeps you can add up to 4 extra personal questions. You also get the chance to enable or disable your questions should they not be applicable anymore.
When enabled the personal questions are asked every beep and can be scored from 1 to 7. You want to ask something that changes over time, ‘How old am I?’ won’t be a good question since you’ll probably answer the same for a whole year.