Now that the school year has already begun, I'm having second thoughts about my elective.

Who can I see to drop my course and switch to another one? Do I do it on SOLAR? I already payed my fees ....will that affect if I can change it?

There's another thread about this, but yes you do it on SOLAR. Just make sure you add your new course before the drop/add date.
Tuition is on a per-unit basis, so as long as your number of units don't change, your tuition won't change.

Thank you so much !!!

Will TA's of new course get this update too? Because tutorials are usually small with attendance.