The one exception to this is when someone else takes the same appointment slot while you were thinking about it. Fortunately, this doesn't happen very often. What I Am Signed Up For option on the main page to verify the appointment. You should also write down the date, time, and place of the appointment. It is very important that you actually appear at the time and place of your appointment.
Some experiments require a lot of time and effort to set up.
If you do not find an experiment in which you are interested or a time that works for you, you can exit without signing up. You can then check again at a later date for other experiments and times. Please note that there can be as much as a three-day delay between completion of an experiment and when the credit hours appear in the system. If you have not received the expected credit hours for an experiment within a week after its completion, you should contact the experimenter. This will give you a list of the experiments that you have signed up for, including where and when to go.