For A.Y. 2023/24, the study plan is automatically filled in. *So no action on your part is required*.
To view the study plan, you can access the online services in the Teaching Career section. (From August 28)
In the Teaching Career section, you will also be able to view the schedule of classes starting on September 13.
For students coming from other universities, with a previous career, automatic generation is not possible: in this case, it is necessary to fill out the study plan in the period August 23-September 18.
Keep in mind as of now that, starting from the second year of the course, you will instead have to make your own plan of studies entry through Online Services.