From March 26 to April 21, 2025, each student can fill in and submit their study plan; even a study plan submitted in Autumn 2024 can be modified. Each of the following websites includes a document about filling in the study plan, called Study Plan Guidelines for Spring 2024-25:
https://www.development-lm.unifi.it/index.php?module=CMpro&func=viewpage&pageid=172
https://www.development-lm.unifi.it/index.php?module=CMpro&func=viewpage&pageid=385
https://www.development-lm.unifi.it/index.php?module=CMpro&func=viewpage&pageid=412
In particular, the above mentioned document (in its footnote 3) describes how to insert an internship into the study plan.