How to rearrange schedule?

I want to change the days and time that I take these classes: Gen Chem LAB, Intro to College math for sciences LEC and LCA, Gen Chem LEC. Growl doesn’t give me the option to change them though, so would a counselor be able to change it for me? I’ve already found which classes I could take and made sure they would work for my schedule. This is so that I can take the train from my parents house to Riverside every Monday. Would changing which time and day I take these classes be allowed?

also do you need to have a good reason to change your schedule?