You can always check in with your college Admissions and Records and they can be more specific on when they will release the application online for students to start their applications. I have provided their contact information below for your reference.
12500 Campus Drive
Enrollment applications cannot be transferred from one term to another. You will not be able to submit your enrollment application for the Spring term until the college allows you to. Spring terms for most colleges are available sometime in October. Until the application is available, you won't be able to apply to it. Please let us know if you have any questions.
Please feel free to reach out to the records/admissions office of Merritt College. I have provided the contact information and there is an option to email them.