Whenever you have questions, concerns or need assistance, simply ask aloud who is on duty in the lab. At all times the lab is open, a trained willing Teaching Assistant is on duty to help you. The TA is your most knowledgeable source of information and aid, do not hesitate to make use of them, they are there for the sole purpose of assisting you in using the lab.
If you are dissatisfied with the assistance you are receiving or in need of additional assistance you may talk directly with the Lab Manager in Doolan 104.