Urgent Enrolling Question!

<p>Ok so I'm an engineering major, freshman. My second pass is November 29th at 12:30pm, and I wanna enroll into Chem20B and Chemistry 20L. The 20B lectures that my schedule with the classes I've already got are full, and the Chem Lab lecture only has 20 spots left which I'm pretty sure will run out and there's a lab that's already on Waitlist. How am I supposed to approach this? Who do I contact to get the classes I want and if I can't get the classes am I supposed to just ask the professor? Please guide me through all possible routes I could take! Thanks so much</p>

<p>*the 20B lectures that fit my</p>